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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2015	Nov. 03, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	NNBR
Entity Registrant Name	NN INC
Entity Central Index Key	0000918541
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		26,838,339

Condensed Consolidated Statements of Income (Loss) and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 154,824	$ 125,632	$ 483,425	$ 334,840
Cost of products sold (exclusive of depreciation and amortization shown separately below)	120,195	100,441	378,220	265,010
Selling, general and administrative	11,949	11,124	37,910	29,799
Acquisition related costs excluded from selling, general and administrative	3,948	5,651	3,948	7,080
Depreciation and amortization	8,610	5,864	25,702	13,824
Income from operations	10,122	2,552	37,645	19,127
Interest expense	4,584	5,622	16,543	6,737
Other expense, net	593	1,557	2,012	1,769
Income (loss) before provision (benefit) for income taxes and share of net income from joint venture	4,945	(4,627)	19,090	10,621
Provision (benefit) for income taxes	936	(562)	4,009	4,247
Share of net income from joint venture	621	225	2,503	225
Net income (loss)	4,630	(3,840)	17,584	6,599
Other comprehensive loss:
Foreign currency translation loss	(5,332)	(9,068)	(17,562)	(10,432)
Change in fair value of interest rate hedge	(1,419)		(3,044)
Comprehensive loss	$ (2,121)	$ (12,908)	$ (3,022)	$ (3,833)
Basic income (loss) per common share:	$ 0.17	$ (0.21)	$ 0.87	$ 0.36
Weighted average shares outstanding	26,839	17,979	20,122	17,749
Diluted income (loss) per common share:	$ 0.17	$ (0.21)	$ 0.86	$ 0.36
Weighted average shares outstanding	27,167	17,979	20,467	18,120
Cash dividends per common share	$ 0.07	$ 0.07	$ 0.21	$ 0.21

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash	$ 40,102	$ 37,317
Accounts receivable, net	108,144	97,510
Inventories	92,579	91,469
Other current assets	17,560	16,503
Total current assets	258,385	242,799
Property, plant and equipment, net	266,562	278,442
Goodwill, net	85,447	83,941
Intangible asset, net	51,829	52,827
Investment in joint venture	37,088	34,703
Other non-current assets	20,165	20,001
Total assets	719,476	712,713
Current liabilities:
Accounts payable	60,338	71,094
Accrued salaries, wages and benefits	18,362	21,148
Current maturities of long-term debt	21,677	22,160
Income taxes payable	4,933	3,274
Current portion of obligations under capital lease	5,066	5,418
Other current liabilities	10,747	14,504
Total current liabilities	121,123	137,598
Non-current deferred tax liabilities	46,950	49,461
Long-term debt, net of current portion	184,356	328,026
Obligations under capital lease, net of current portion	10,759	14,539
Other non-current liabilities	12,584	9,390
Total liabilities	375,772	539,014
Total stockholders' equity	343,704	173,699
Total liabilities and stockholders' equity	$ 719,476	$ 712,713

Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Non-controlling Interest [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2014	$ 173,699	$ 190	$ 99,095	$ 69,015	$ 32	$ 5,367
Beginning Balance, Shares at Dec. 31, 2014		18,983
Net income	17,584			17,584
Dividends declared	(4,554)			(4,554)
Shares issued for option exercises	$ 1,831	$ 1	1,830
Shares issued for option exercises, Shares	160	160
Shares issued	$ 173,052	$ 76	172,976
Shares issued, Shares		7,590
Stock option expense	716		716
Restricted stock expense	1,747	$ 1	1,746
Restricted stock expense, Shares		115
Performance stock unit expense	456		456
Restricted shares withheld from employees for tax obligations	(222)		(222)
Restricted shares withheld from employees for tax obligations, Shares		(9)
Foreign currency translation loss	(17,562)					(17,562)
Change in fair value of interest rate hedge	(3,044)					(3,044)
Ending Balance at Sep. 30, 2015	$ 343,704	$ 268	$ 276,597	$ 82,045	$ 32	$ (15,239)
Ending Balance, Shares at Sep. 30, 2015		26,839

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating Activities:
Net income	$ 17,584	$ 6,599
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,702	13,824
Amortization of debt issuance costs	1,827	498
Debt issuance costs write-off		1,398
Joint venture net income in excess of cash received	(2,503)	(225)
Share-based compensation expense	2,919	1,825
Changes in operating assets and liabilities:
Accounts receivable	(11,361)	(17,838)
Inventories	(3,940)	(4,462)
Accounts payable	(8,380)	493
Other assets and liabilities	(8,593)	(635)
Net cash provided by operating activities	13,255	1,477
Investing Activities:
Acquisition of property, plant and equipment	(26,318)	(14,793)
Cash paid to acquire business, net of cash received	(9,017)	(259,504)
Proceeds from disposals of property, plant and equipment	441
Dividends received from joint venture	869	2,538
Net cash used by investing activities	(34,025)	(271,759)
Financing Activities:
Proceeds/(Repayment) from short-term debt, net	(1,458)	(763)
Debt issue costs paid	(136)	(9,380)
Principal payments on capital lease	(3,990)	(554)
Proceeds from long-term debt	8,517	309,371
Repayment of long-term debt	(149,530)
Payment for acquisition of non-controlling interest		(2,528)
Dividends paid	(4,554)	(3,802)
Shares issued	173,052
Proceeds from issuance of stock and exercise of stock options	1,831	1,550
Net cash provided by financing activities	23,732	293,894
Effect of exchange rate changes on cash flows	(177)	241
Net Change in Cash	2,785	23,853
Cash at Beginning of Period	37,317	3,039
Cash at End of Period	$ 40,102	$ 26,892

Interim Financial Statements	9 Months Ended
Interim Financial Statements	Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Interim Financial Statements	Note 1. Interim Financial Statements The accompanying condensed consolidated financial statements of NN, Inc. have not been audited, except that the condensed consolidated balance sheet at December 31, 2014 was derived from our audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2014, which was filed with the U.S. Securities and Exchange Commission, or SEC, on March 16, 2015. In our opinion, these financial statements reflect all adjustments necessary to fairly state the results of operations for the three and nine month periods ended September 30, 2015 and 2014, our financial position at September 30, 2015 and December 31, 2014, and the cash flows for the nine month periods ended September 30, 2015 and 2014 on a basis consistent with our audited financial statements. These adjustments are of a normal recurring nature and are, in the opinion of management, necessary for fair statement of the financial position and operating results for the interim periods. As used in this Quarterly Report on Form 10-Q, the terms “NN”, “the Company”, “we”, “our”, or “us” mean NN, Inc. and its subsidiaries. Certain information and footnote disclosures normally included in the consolidated financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted from the interim financial statements presented in this Quarterly Report on Form 10-Q. These unaudited, condensed and consolidated financial statements should be read in conjunction with our audited consolidated financial statements and the notes thereto included in our most recent Annual Report on Form 10-K for the year ended December 31, 2014, which we filed with the SEC on March 16, 2015. The results for the three and nine month periods ended September 30, 2015 are not necessarily indicative of results for the year ending December 31, 2015 or any other future periods.

Acquisitions

9 Months Ended

Sep. 30, 2015

Business Combinations [Abstract]

Acquisitions

Note 2. Acquisitions

2015 Acquisition

On May 29, 2015, NN completed the acquisition of Caprock Manufacturing, Inc. and Caprock Enclosures, LLC (collectively referred to as “Caprock”) for approximately $9,000 in cash. Caprock was a privately held plastic components supplier located in Lubbock, TX. Caprock serves multiple end markets including aerospace, medical and general industrial. The acquisition provides further balancing of our end markets and represents the first step in our focused plan toward transforming our plastics business. The results of Caprock have been consolidated with NN since the date of acquisition as part of the Plastic and Rubber Components Segment. We are in the process of finalizing fair market valuations of all the net assets acquired. The preliminary purchase price allocation includes $1,452 in net working capital, $2,960 in property plant and equipment, $2,490 in intangible assets, and $2,099 in goodwill, which we expect to be fully deductible for tax purposes. The goodwill is attributable to expected cost synergies and revenue growth plus the assembled work force.

For information regarding NN’s acquisition of Precision Engineered Products Holdings, Inc. (“PEP”), which was completed on October 19, 2015, please see Note 15 of the Notes to Consolidated Financial Statements.

2014 Acquisitions

Autocam

On August 29, 2014, we completed our merger with Autocam Corporation (“Autocam”), for $256,837 in cash and $31,717 in NN stock. Additionally, we assumed $29,160 in Autocam debt and capital lease obligations. Autocam is a global leader in the engineering, manufacture and assembly of highly complex, system critical components for fuel systems, engines and transmission, power steering and electric motors. With the completion of the Autocam merger, NN became one of the top global manufacturers in the precision metal components space. Additionally, this acquisition leverages NN’s and Autocam’s complementary core strengths and values and positions our Precision Metal Components business segment to outgrow its end markets by taking advantage of global market trends in fuel efficient technologies such as gasoline direct injection systems, high-pressure diesel injection systems and variable valve timing. The funding of the cash portion of the purchase price and acquisition costs was provided primarily from borrowings, including a $350,000 term loan entered into concurrent with the acquisition of Autocam.

The following table summarizes the preliminary purchase price allocation for the Autocam merger at September 30, 2014, which was subsequently adjusted on our Annual Report on Form 10-K filed March 16, 2015:


Preliminary fair value of assets acquired and liabilities assumed on August 29, 2014
Current assets	$	88,529
Property, plant, and equipment		146,120
Intangible assets subject to amortization		51,098
Investment in joint venture		35,595
Other non-current assets		2,170
Goodwill		77,548

Total assets acquired	$	401,060

Current liabilities		34,320
Current maturities of long-term debt		6,547
Non-current deferred tax liabilities		46,998
Obligations under capital lease		18,350
Long-term debt, net of current portion		4,263
Other non-current liabilities		2,028

Total liabilities assumed	$	112,506

Net asset acquired	$	288,554

The combination of income, market, and cost approaches were used for the preliminary valuation where appropriate, depending on the asset or liability being valued. Valuation inputs in these models and analyses gave consideration to market participant assumptions. Acquired intangible assets were primarily customer relationships and trade names. The final purchase price allocation was completed during our year end closing process and updated on our 2014 Annual Report on Form 10-K filed on March 16, 2015.

In connection with the acquisition of Autocam, we recorded goodwill, which represented the excess of the purchase price over the estimated preliminary fair value of tangible and intangible assets acquired, net of liabilities assumed. The goodwill was attributed primarily to Autocam as a going concern and the fair value of expected cost synergies and revenues growth from combining the NN and Autocam businesses. The going concern element represents the ability to earn a higher return on the combined assembled collection of assets and businesses of Autocam than if those assets and businesses were to be acquired and managed separately. Other relevant elements of goodwill are the benefits of access to certain markets and the assembled work force. None of the goodwill is expected to be deducted for tax purposes.

Property, plant and equipment acquired primarily included machinery and equipment for use in manufacturing operations. Additionally, a number of manufacturing sites and related facilities, land and leased manufacturing sites that include leasehold improvements were acquired. Property, plant and equipment has been preliminarily valued using the cost approach supported where available by observable market data which includes consideration of obsolescence. Intangible assets have been preliminarily valued using the relief from royalty and multi-period excess earnings methods, both forms of the income approach supported by observable market data.

Related to the acquisition of Autocam, in the third quarter and first nine months of 2014, we recognized $5,316 and $5,857, respectively, in transaction costs. During the third quarter and the first nine months of 2014, we expensed $2,974 of deferred financing costs and make whole interest payments related to the acquisition. Transaction costs were expensed as incurred and were included in the “Acquisition related costs excluded from selling, general and administrative expenses” line item and deferred financing costs were included in the interest expense line items in the Unaudited Condensed Consolidated Statements of Income (Loss) and Comprehensive Loss. As required by purchase accounting, the acquired inventories were recorded at their preliminary estimated fair value. These inventories were sold in the third quarter 2014 resulting in a one-time $1,992 increase in cost of sales. Beginning September 1, 2014, the consolidated results of operations of NN include the results of the acquired Autocam businesses.

The unaudited pro forma financial results for three months ended September 30, 2014 and September 30, 2013 and nine months ended September 30, 2014 and September 30, 2013 combine the consolidated results of NN and Autocam giving effect to the acquisition of Autocam as if it had been completed on January 1, 2013, the beginning of the comparable prior annual reporting period presented. The unaudited pro forma financial results presented below do not include any anticipated synergies or other expected benefits of the acquisition. This unaudited pro forma financial information is presented for informational purposes only and is not indicative of future operations or results had the acquisition been completed as of January 1, 2013.

The unaudited pro forma financial results include certain adjustments for additional depreciation and amortization expense based upon the preliminary fair value step-up and estimated useful lives of Autocam depreciable fixed assets and definite-life amortizable assets acquired in the transaction. The unaudited pro forma results also include adjustments to net interest expense and early debt extinguishment costs related to the transaction. The provision for income taxes has also been adjusted for all periods, based upon the foregoing adjustments to historical results.


	Three Months ended September 30,				Nine Months ended September 30,
	2014		2013		2014		2013
Pro forma sales	$	166,979	$	152,708	$	505,891	$	457,466
Pro forma net income	$	4,867	$	5,436	$	19,815	$	(224	)

The pro forma net income for the nine months ended September 30, 2013 includes certain items, such as financing, integration, and transaction costs historically recorded by NN and Autocam directly attributable to the acquisition, which will not have an ongoing impact. These items include transaction, integration, and financing related costs incurred by NN and Autocam of $8,509 and $8,933, net of tax, and $3,010 and $3,125, net of tax, respectively during third quarter and first nine months of 2014, respectively, and reported in the nine months ended September 30, 2013 pro forma net income above.

Other Acquisitions

On July 15, 2014, we acquired substantially all of the assets of Chelsea Grinding Company (“Chelsea”), a manufacturer of cylindrical rollers used primarily in the hydraulic pump industry and relocated the operations to our Erwin, Tennessee plant and integrated into our Metal Bearing Component Segment.

On June 20, 2014, we acquired 79.2% of the outstanding shares of RFK Valjcici d. d. Konjic (“RFK”) for $9,756 in cash. RFK is a manufacturer of tapered rollers with operations in Konjic, Bosnia & Herzegovina. NN acquired up to 99.7% of the shares of RFK during the third quarter of 2014 for an additional $2,528 in cash and reclassified this amount from non-controlling interest. RFK’s products, while complementary to NN’s existing roller bearing components, broadened our product offering and allowed penetration into adjacent markets. The results of the operations of RFK have been consolidated with NN since the date of acquisition as a part of the Metal Bearing Components Segment.

On January 30, 2014, we purchased the majority of the operating assets of V-S Industries, V-S Precision, LLC and V-S Precision SA de DV (collectively referred to as “VS”) from the secured creditors of V-S Industries for $5,580 in cash and assumed certain liabilities totaling $2,968. This was accounted for as a business combination. VS is a precision metal components manufacturer that supplies customers in a variety of industries including electric motors, HVAC, power tools, automotive and medical. The acquisition of VS provided us with a complementary, broader product offering and allowed penetration into adjacent markets. VS has two locations in Wheeling, Illinois and Juarez, Mexico and is included in Autocam Precision Components Segment. The results of VS have been consolidated with NN since the date of acquisition.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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+ Details

Inventories

9 Months Ended

Sep. 30, 2015

Inventory Disclosure [Abstract]

Inventories

Note 3. Inventories

Inventories are comprised of the following:


	September 30, 2015		December 31, 2014
Raw materials	$	40,543	$	35,191
Work in process		20,519		21,883
Finished goods		31,517		34,395

	$	92,579	$	91,469

Inventories on consignment at customer locations as of September 30, 2015 and December 31, 2014 totaled $3,872 and $5,857, respectively.

Inventories are stated at the lower of cost or market. Cost is determined using the average cost method. The inventory valuations above were developed using normalized production capacities for each of our manufacturing locations. Any costs from abnormal excess capacity or under-utilization of fixed production overheads are expensed in the period incurred and are not included as a component of inventory valuation.

Net Income Per Share

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Net Income Per Share

Note 4. Net Income Per Share


	Three Months Ended September 30,					Nine Months Ended September 30,
	2015		2014			2015		2014
Net income (loss)	$	4,630	$	(3,840	)	$	17,584	$	6,599

Weighted average shares outstanding		26,839		17,979			20,122		17,749
Effective of dilutive stock options		328		—			345		371

Diluted shares outstanding		27,167		17,979			20,467		18,120

Basic net income (loss) per share	$	0.17	$	(0.21	)	$	0.87	$	0.36

Diluted net income (loss) per share	$	0.17	$	(0.21	)	$	0.86	$	0.36

There were no anti-dilutive options excluded from the dilutive shares outstanding for the three and nine month periods ended September 30, 2015 and 2014. During the three month period ended September 30, 2015, we issued 7,590 shares of common stock sold in a public offering. (See Note 14 of Notes to Condensed Consolidated Financial Statements).

Segment Information

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Segment Information

Note 5. Segment Information

The segment information and the accounting policies of each segment are the same as those described in the notes to the consolidated financial statements entitled “Segment Information” and “Summary of Significant Accounting Policies and Practices,” respectively, included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014, which we filed with the SEC on March 16, 2015. Autocam was added to the Precision Metal Components Segment during the third quarter of 2014 and the segment was renamed the Autocam Precision Components Segment during the fourth quarter of 2014. We account for inter-segment sales and transfers at current market prices. We did not have any significant inter-segment transactions during the three and nine month periods ended September 30, 2015 and 2014.


(In Thousands of Dollars)	Metal Bearing Components Segment		Autocam Precision Components Segment		Plastic and Rubber Components Segment		Corporate and Consolidations			Total
Three Months ended September 30, 2015
Revenues from external customers	$	60,545	$	83,243	$	11,036	$	—		$	154,824
Income (loss) from operations	$	6,633	$	10,894	$	595	$	(8,000	)	$	10,122

Nine Months ended September 30, 2015
Revenues from external customers	$	203,041	$	252,336	$	28,048	$	—		$	483,425
Income (loss) from operations	$	25,125	$	27,707	$	1,309	$	(16,496	)	$	37,645
Total assets	$	209,120	$	431,478	$	28,808	$	50,070		$	719,476

(In Thousands of Dollars)	Metal Bearing Components Segment		Autocam Precision Components Segment		Plastic and Rubber Components Segment		Corporate and Consolidations			Total
Three Months ended September 30, 2014
Revenues from external customers	$	69,575	$	46,637	$	9,420	$	—		$	125,632
Income (loss) from operations	$	7,644	$	5,515	$	178	$	(10,785	)	$	2,552

Nine Months ended September 30, 2014
Revenues from external customers	$	213,513	$	95,642	$	25,685	$	—		$	334,840
Income (loss) from operations	$	25,164	$	10,724	$	827	$	(17,588	)	$	19,127
Total assets	$	216,527	$	447,946	$	18,157	$	30,509		$	713,139

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 34
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+ Details

Long-Term Debt and Short-Term Debt

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Long-Term Debt and Short-Term Debt

Note 6. Long-Term Debt and Short-Term Debt

Long-term debt and short-term debt at September 30, 2015 and December 31, 2014 consisted of the following:


	September 30, 2015		December 31, 2014
Borrowings under our $350,000 Term Loan B bearing interest at the greater of 1% or 3 month LIBOR (0.283% at September 30, 2015) plus an applicable margin of 5.00% at September 30, 2015 expiring August 29, 2021, net of discount of $4,432.	$	198,992	$	340,005
Borrowings under our $100,000 ABL Revolver bearing interest at a floating rate equal to LIBOR (0.187% at September 30, 2015) plus an applicable margin of 1.75% at September 30, 2015 expiring August 29, 2019.		—		—
French Safeguard obligations		2,363		2,560
Brazilian equipment notes		917		5,304
Chinese line of credit		3,761		2,317

Total debt		206,033		350,186
Less current maturities of long-term debt		21,677		22,160

Long-term debt, excluding current maturities of long-term debt	$	184,356	$	328,026

Our $350,000 term loan facility, or Term Loan, may be expanded upon our request with approval of the lenders by up to $50,000 under the same terms and conditions. The Term Loan has a seven year maturity with a 5% per annum repayment. The Term Loan agreement is a covenant lite agreement with no financial covenants. The Term Loan agreement does contain customary restrictions on, among other things, additional indebtedness, liens on our assets, sales or transfers of assets, investments, issuance of equity securities, and mergers, acquisitions and other fundamental changes in our business including a “material adverse change” clause, which if triggered would give the lenders the right to accelerate the maturity of the debt. Costs associated with entering into the revolving credit facility were capitalized and will be amortized into interest expense over the life of the facility. As of September 30, 2015, $8,092 of net capitalized loan origination costs related to the Term Loan are reflected in the Unaudited Condensed Consolidated Balance Sheet within other non-current assets.

Our $100,000 asset backed loan, or ABL, may be expanded upon our request with approval of the lenders by up to $50,000 under the same terms and conditions. The ABL has a five year maturity and has one springing financial covenant in the event our availability on the ABL is less than $8,000. The ABL contains customary restrictions on, among other things, additional indebtedness, liens on our assets, sales or transfers of assets, investments, issuance of equity securities, and mergers, acquisitions and other fundamental changes in our business including a “material adverse change” clause, which if triggered would give the lenders the right to accelerate the maturity of the debt. The facility has a swing line feature to meet short term cash flow needs. Any borrowings under this swing line are considered short term. We incurred costs as a result of issuing the ABL, which have been recorded in the condensed consolidated balance sheet within other non-current assets and are being amortized over the term of the notes. The unamortized balance at September 30, 2015 was $1,132.

We believe the book values of the above credit facilities approximate their fair values given the interest rates are variable and are consistent with market rates for a company with our credit profile.

In connection with the acquisition of PEP and subsequent to September 30, 2015, NN entered into new credit agreement providing for new senior secured credit facilities. Proceeds from borrowings under the new senior secured credit facilities were used to fund the purchase price for PEP and to repay borrowings under our existing Term Loan and ABL facilities. (See Note 15 of Notes to Condensed Consolidated Financial Statements.)

Our French operation (acquired with Autocam) has liabilities with certain creditors subject to Safeguard protection. The liabilities are being paid annually over a 10-year period until 2019 and carry a zero percent interest rate. Amounts due as of September 30, 2015, to those creditors opting to be paid over a 10-year period totaled $2,363 and are included in current maturities of long-term debt of $304 and long-term debt, net of current portion of $2,059.

The Brazilian equipment notes represent borrowings from certain Brazilian banks to fund equipment purchases for Autocam’s Brazilian plants. These credit facilities have annual interest rates ranging from 2.5% to 9.1%.

The Chinese line of credit is a working capital line of credit with a Chinese bank bearing an annual interest rate of 4.95%.

Goodwill, net

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill, net

Note 7. Goodwill, net

The changes in the carrying amount of goodwill, net for the nine month period ended September 30, 2015 are as follows:


(In Thousands of Dollars)	Metal Bearing Components Segment			Autocam Precision Components Segment		Plastic and Rubber Segment		Total
Balance as of January 1, 2015	$	9,949		$	73,992		—	$	83,941
Goodwill acquired in acquisition		—			—		2,099		2,099
Currency translation impacts		(593	)		—		—		(593	)

Balance as of September 30, 2015	$	9,356		$	73,992	$	2,099	$	85,447

The goodwill balances are tested for impairment on an annual basis during the fourth quarter and between annual tests if a triggering event occurs. As of September 30, 2015, there were no indications of impairment at the reporting units with goodwill balances.

Intangible Assets, Net	9 Months Ended
Intangible Assets, Net	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets, Net	Note 8. Intangible Assets, Net With the Caprock acquisition, we acquired intangible assets with a preliminary aggregate acquired value of $2,490. The intangible assets are a customer relationship intangible asset with a preliminary estimated value of $2,430 and a trade name intangible asset with a preliminary estimated value of $60. The preliminary estimated useful lives of the intangibles are 12 years and one year, respectively. These intangible assets are subject to amortization of approximately $203 per year with year-to-date amortization expense and accumulated amortization of $88 at September 30, 2015. Including the intangibles from the Caprock acquisition, we have gross intangible assets of $57,226 with accumulated amortization of $5,397, year-to-date amortization expense of $3,013 and annual expected amortization expense of $4,090.

Shared-Based Compensation

9 Months Ended

Sep. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Shared-Based Compensation

Note 9. Shared-Based Compensation

During the three and nine month periods ended September 30, 2015 and 2014, approximately $1,148 and $2,919 in 2015 and $661 and $1,948 in 2014, respectively, of compensation expense was recognized in selling, general and administrative expense for all share-based awards. During the nine month period ended September 30, 2015, there were 115 restricted stock awards and 55 option awards to non-executive directors, officers and certain other key employees. Additionally, during the nine months ended September 30, 2015, there were 70 performance stock units issued. During the nine month period ended September 30, 2014, there were 97 restricted stock awards and 98 option awards to non-executive directors, officers and certain other key employees.

The restricted shares granted during the nine month period ended September 30, 2015, vest pro-rata over three years for officers and certain other key employees and over one year for non-executive directors. The restricted shares granted during the nine month period ended September 30, 2014, vest pro-rata over three years. During the nine month periods ended September 30, 2015 and 2014, we incurred $1,747 and $951, respectively, in expense related to restricted stock. The fair value of the shares issued was determined by using the grant date closing price of our common stock.

The performance stock units granted during the nine month period ended September 30, 2015, will be satisfied in the form of company stock during 2018 depending on meeting certain performance and/or market conditions. We are recognizing the compensation expense over the three year period in which the performance and market conditions are measured. During the nine month periods ended September 30, 2015 and 2014, we incurred $456 and $0, respectively, in expense related to performance stock units. The fair value of the shares issued was determined by using the grant date closing price of our common stock for the units with a performance condition and a Monte Carlo valuation model was used to determine the fair value for shares that have a market condition.

We incurred $716 and $997 of stock option expense in the nine month periods ended September 30, 2015 and 2014, respectively. The fair value of our options cannot be determined by market value, because our options are not traded in an open market. Accordingly, we utilized the Black Scholes financial pricing model to estimate the fair value.

The following table provides a reconciliation of option activity for the nine month period ended September 30, 2015:


Options	Shares (000)			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value ($000)
Outstanding at January 1, 2015		1,175		$	11.40
Granted		55		$	25.16
Exercised		(160	)	$	11.49
Forfeited or expired		(3	)	$	13.12

Outstanding at September 30, 2015		1,067		$	12.08		6.1	$	7,359	⁽¹⁾

Exercisable at September 30, 2015		857		$	10.91		5.5	$	6,549	⁽¹⁾

⁽¹⁾	The intrinsic value is the amount by which the market price of our stock was greater than the exercise price of any individual option grant at September 30, 2015.

Provision for Income Taxes	9 Months Ended
Provision for Income Taxes	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Provision for Income Taxes	Note 10. Provision for Income Taxes For the nine month periods ended September 30, 2015 and 2014, our effective tax rates were 21% and 40%, respectively. The difference between the U.S. federal statutory tax rate of 34% and our effective tax rates was primarily due to non-U.S. based earnings being taxed at lower rates reducing the effective rates for the nine month periods ended September 30, 2015 by 8%. The difference between the U.S. federal statutory tax rate of 34% and our effective tax rate in the first nine months of 2014 of 40% was due to the impact of non-deductible merger and acquisition expenses increasing the tax rate 12% during 2014 partially offset by non-U.S. based earnings being taxed at lower rates reducing the effective rate 6%. As of September 30, 2015, we do not foresee any significant changes to our unrecognized tax benefits within the next twelve months.

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 11. Commitments and Contingencies Brazil ICMS Tax Matter Prior to our acquisition of Autocam, Autocam’s Brazilian subsidiary received notification from the Brazilian tax authorities regarding ICMS (State Value Added Tax or VAT) tax credits claimed on intermediary materials (tooling and perishable items) used in the manufacturing process. The Brazilian tax authority notification disallowed state ICMS credits claimed on intermediary materials based on the argument that these items are not intrinsically related to the manufacturing processes. Autocam Brazil filed an administrative defense with the Brazilian tax authority arguing, among other matters, that it should qualify for ICMS tax credit, contending that the intermediary materials are directly related to the manufacturing process. We believe that we have substantial legal and factual defenses, and plan to defend our interests in this matter vigorously. While we believe a loss is not probable, we estimate the range of possible loss related to this assessment is from $0 to $6,000. No amount was accrued at September 30, 2015 for this matter. There has been no change in the status of this matter from December 31, 2014 to September 30, 2015. We are entitled to indemnification from the former shareholders of Autocam, subject to the limitations and procedures set forth in the agreement and plan of merger. Management believes the indemnification would include amounts owed for the tax, interest and penalties related to this matter. All other legal proceedings are of an ordinary and routine nature and are incidental to our operations. Management believes that such proceedings should not, individually or in the aggregate, have a material adverse effect on our business, financial condition, results of operations or cash flows. In making that determination, we analyze the facts and circumstances of each case at least quarterly in consultation with our attorneys and determine a range of reasonably possible outcomes.

Investment in Non-Consolidated Joint Venture

9 Months Ended

Sep. 30, 2015

Equity Method Investments and Joint Ventures [Abstract]

Investment in Non-Consolidated Joint Venture

Note 12. Investment in Non-Consolidated Joint Venture

As part of the acquisition of Autocam, we acquired a 49% investment in a joint venture with an unrelated entity called Wuxi Weifu Autocam Precision Machinery Company, Ltd. (“JV”), a Chinese company located in Wuxi, China.

Below are the components of our JV investment balance at September 30, 2015:


January 1, 2015	$	34,703
Capital contributed to the joint venture		1,999
Our share of cumulative earnings		3,957
Dividends Received		(2,868	)
Accretion of basis difference from purchase accounting		(703	)

September 30, 2015	$	37,088

Set forth below is summarized balance sheet information for the JV:


	September 30, 2015		December 31, 2014
Current assets	$	23,230	$	24,140
Non-current assets		24,117		21,519

Total assets	$	47,347	$	45,659

Current liabilities	$	11,333	$	14,162

Total liabilities	$	11,333	$	14,162

Dividends of $2,868 were declared and paid by the JV during the three months ended September 30, 2015. We had sales to the JV of $42 and $106 during the three and nine months ended September 30, 2015, respectively. Amounts due to us from the JV were $202 as of September 30, 2015. The JV had net sales in 2014 of $50,466 and net income of $9,004. In the first nine months of 2015, the JV had net sales and net income of $35,833 and $7,228, respectively.

Interest Rate Hedging

9 Months Ended

Sep. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Interest Rate Hedging

Note 13. Interest Rate Hedging

Our policy is to manage interest expense using a mix of fixed and variable rate debt. To manage this mix effectively, we may enter into interest rate swaps in which we agree to exchange the difference between fixed and variable interest amounts calculated by reference to an agreed upon notional principal amount.

On December 16, 2014, we entered into a $150,000 interest rate swap that will go into effect on December 29, 2015 (one year delayed start), at which time our interest rate will be locked at 7.216% until December 31, 2018. Prior to December 16, 2014, we did not have any existing interest rate hedges. The hedge instrument will be 100% effective and as such the mark to market gains or losses on this hedge will be included in accumulated other comprehensive income (loss) to the extent effective, and reclassified into interest expense over the term of the related debt instruments.

The table below summarizes the fair value measurements of the gross asset and liability of this swap as of September 30, 2015, valued on a recurring basis:


(Dollars in thousands)				Fair Value Measurements at September 30, 2015
Description	September 30, 2015			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Derivative asset	$	1,609		$	—	$	1,609		$	—
Derivative liability		(5,084	)		—		(5,084	)		—

	$	(3,475	)	$	—	$	(3,475	)	$	—

The interest rate swap derivative is classified as Level 2. Level 2 fair value is based on estimates using standard pricing models. These standard pricing models use inputs which are derived from or corroborated by observable market data such as interest rate yield curves, index forward curves, discount curves, and volatility surfaces. Counterparties to these derivative contracts are highly rated financial institutions which we believe carry only a minimal risk of nonperformance.

We have elected to present the derivative contracts on a gross basis in the Condensed Consolidated Balance Sheet included within other non-current assets and other non-current liabilities. Had we chosen to present the derivative contract on a net basis, we would have a derivative in a net liability position of $3,475 as of September 30, 2015. We do not have any cash collateral due under such agreements.

Derivatives’ Hedging Relationships


(Dollars in thousands)	Amount of after tax of gain/ (loss) recognized in Other Comprehensive Income on Derivatives (effective portion)						Location of gain/(loss) reclassified from Accumulated Other Comprehensive Income into Income (effective portion)		Pre-tax amount of gain/(loss) reclassified from Accumulated Other Comprehensive Income into Income (effective portion)
Derivatives’ Cash Flow Hedging Relationships	September 30, 2015			December 31, 2014					September 30, 2015		December 31, 2014
Forward starting interest rate swap contract	$	(3,475	)	$	(431	)		Interest Expense	$	—	$	—

	$	(3,475	)	$	(431	)			$	—	$	—

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

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+ Details

Equity Offering	9 Months Ended
Equity Offering	Sep. 30, 2015
Text Block [Abstract]
Equity Offering	Note 14. Equity Offering On July 1, 2015, we closed an underwritten registered public offering of common stock offered pursuant to a shelf registration statement on Form S-3 that was previously filed with, and declared effective by, the SEC. The total number of shares of common stock sold was 7,590 at a public offering price of $24.00 per share. All of the shares in the offering were sold by NN. The net proceeds to NN from the offering, after deducting underwriting discounts and commissions and offering expenses, were approximately $173,052. Of these proceeds, $148,739 was used for repayment of principal and interest on our Term Loan and ABL facilities during the three months ended September 30, 2015.

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Note 15. Subsequent Events *Acquisition of PEP* On October 19, 2015, we acquired Precision Engineered Products Holdings, Inc. (“PEP”) for $615,000 in cash. The effects of this acquisition are not reflected in the financial statements presented in this Quarterly Report on Form 10-Q because the acquisition occurred subsequent to September 30, 2015. PEP is a global manufacturer of highly engineered precision customized solutions serving the medical, electrical, transportation and aerospace end markets. The addition of the PEP business into our portfolio is a transformative step in creating a diversified industrial company that serves a variety of end markets and delivers consistent results through the economic cycle. PEP strengthens our technical capabilities and provides us with additional dynamic platforms to support outgrowth of our end markets. PEP’s focus on the medical, electrical, and aerospace end markets and delivery of world class precision and technology to their customers aligns perfectly with our strategic plan allowing us to develop new products and drive operational efficiency in the years to come. Concurrent with our acquisition of PEP, we completed our previously announced private offering of $300,000 aggregate principal amount of 10.25% Senior Notes due 2020 (the “Senior Notes”), and entered into new senior secured credit facilities consisting of a $525,000 term loan credit facility with an interest rate of the greater of LIBOR or 1.0%, plus an applicable margin of 4.75% and a $100,000 revolving loan credit facility with an interest rate of the greater of LIBOR plus an applicable margin of 3.50%. We utilized the net proceeds from the Senior Notes, together with borrowings under our new term loan credit facility and cash on hand, to pay the purchase price for the PEP acquisition, to repay borrowings under our existing Term Loan and ABL facilities and to pay fees and expenses related to the foregoing during the three months ended December 31, 2015. Additional details regarding the financing of the PEP acquisition may be found in our Current Report on Form 8-K filed with the Securities and Exchange Commission on October 20, 2015. *Closure of Wheeling Plant* On November 5, 2015, we announced the closure of our Wheeling Plant, which is included in the Autocam Precision Components Segment. This closure directly relates to the integration plan developed with the Autocam acquisition in 2014. The majority of the sales and productive assets will be relocated to existing plants with the Autocam Precision Components Segment. During the fourth quarter of 2015, we plan to take a restructuring charge preliminarily estimated with a range of approximately $4,500 to $6,000. The closure is expected to be finalized during the first half of 2016.

Acquisitions (Tables) - Autocam [Member]

9 Months Ended

Sep. 30, 2015

Summary of Estimated Preliminary Fair Values of Assets Acquired and Liabilities Assumed


Preliminary fair value of assets acquired and liabilities assumed on August 29, 2014
Current assets	$	88,529
Property, plant, and equipment		146,120
Intangible assets subject to amortization		51,098
Investment in joint venture		35,595
Other non-current assets		2,170
Goodwill		77,548

Total assets acquired	$	401,060

Current liabilities		34,320
Current maturities of long-term debt		6,547
Non-current deferred tax liabilities		46,998
Obligations under capital lease		18,350
Long-term debt, net of current portion		4,263
Other non-current liabilities		2,028

Total liabilities assumed	$	112,506

Net asset acquired	$	288,554

Summary of Unaudited Proforma Information

The provision for income taxes has also been adjusted for all periods, based upon the foregoing adjustments to historical results.


	Three Months ended September 30,				Nine Months ended September 30,
	2014		2013		2014		2013
Pro forma sales	$	166,979	$	152,708	$	505,891	$	457,466
Pro forma net income	$	4,867	$	5,436	$	19,815	$	(224	)

Inventories (Tables)

9 Months Ended

Sep. 30, 2015

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories are comprised of the following:


	September 30, 2015		December 31, 2014
Raw materials	$	40,543	$	35,191
Work in process		20,519		21,883
Finished goods		31,517		34,395

	$	92,579	$	91,469

Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Summary of Net Income Per Share


	Three Months Ended September 30,					Nine Months Ended September 30,
	2015		2014			2015		2014
Net income (loss)	$	4,630	$	(3,840	)	$	17,584	$	6,599

Weighted average shares outstanding		26,839		17,979			20,122		17,749
Effective of dilutive stock options		328		—			345		371

Diluted shares outstanding		27,167		17,979			20,467		18,120

Basic net income (loss) per share	$	0.17	$	(0.21	)	$	0.87	$	0.36

Diluted net income (loss) per share	$	0.17	$	(0.21	)	$	0.86	$	0.36

Segment Information (Tables)

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Segment Information

Autocam Precision Components Segment			Plastic and Rubber Components Segment			Corporate and Consolidations			Total
Three Months ended September 30, 2015
Revenues from external customers	$	60,545		$	83,243		$	11,036		$	—		$	154,824
Income (loss) from operations	$	6,633		$	10,894		$	595		$	(8,000	)	$	10,122

Nine Months ended September 30, 2015
Revenues from external customers	$	203,041		$	252,336		$	28,048		$	—		$	483,425
Income (loss) from operations	$	25,125		$	27,707		$	1,309		$	(16,496	)	$	37,645
Total assets	$	209,120		$	431,478		$	28,808		$	50,070		$	719,476

(In Thousands of Dollars)	Metal Bearing Components Segment			Autocam Precision Components Segment			Plastic and Rubber Components Segment			Corporate and Consolidations			Total
Three Months ended September 30, 2014
Revenues from external customers	$	69,575		$	46,637		$	9,420		$	—		$	125,632
Income (loss) from operations	$	7,644		$	5,515		$	178		$	(10,785	)	$	2,552

Nine Months ended September 30, 2014
Revenues from external customers	$	213,513		$	95,642		$	25,685		$	—		$	334,840
Income (loss) from operations	$	25,164		$	10,724		$	827		$	(17,588	)	$	19,127
Total assets	$	216,527		$	447,946		$	18,157		$	30,509		$	713,139

Long-Term Debt and Short-Term Debt (Tables)

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Summary of Long-Term Debt and Short-Term Debt

Long-term debt and short-term debt at September 30, 2015 and December 31, 2014 consisted of the following:


	September 30, 2015		December 31, 2014
Borrowings under our $350,000 Term Loan B bearing interest at the greater of 1% or 3 month LIBOR (0.283% at September 30, 2015) plus an applicable margin of 5.00% at September 30, 2015 expiring August 29, 2021, net of discount of $4,432.	$	198,992	$	340,005
Borrowings under our $100,000 ABL Revolver bearing interest at a floating rate equal to LIBOR (0.187% at September 30, 2015) plus an applicable margin of 1.75% at September 30, 2015 expiring August 29, 2019.		—		—
French Safeguard obligations		2,363		2,560
Brazilian equipment notes		917		5,304
Chinese line of credit		3,761		2,317

Total debt		206,033		350,186
Less current maturities of long-term debt		21,677		22,160

Long-term debt, excluding current maturities of long-term debt	$	184,356	$	328,026

Goodwill, net (Tables)

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill, net for the nine month period ended September 30, 2015 are as follows:


(In Thousands of Dollars)	Metal Bearing Components Segment			Autocam Precision Components Segment		Plastic and Rubber Segment		Total
Balance as of January 1, 2015	$	9,949		$	73,992		—	$	83,941
Goodwill acquired in acquisition		—			—		2,099		2,099
Currency translation impacts		(593	)		—		—		(593	)

Balance as of September 30, 2015	$	9,356		$	73,992	$	2,099	$	85,447

Shared-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Reconciliation of Option Activity

The following table provides a reconciliation of option activity for the nine month period ended September 30, 2015:


Options	Shares (000)			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value ($000)
Outstanding at January 1, 2015		1,175		$	11.40
Granted		55		$	25.16
Exercised		(160	)	$	11.49
Forfeited or expired		(3	)	$	13.12

Outstanding at September 30, 2015		1,067		$	12.08		6.1	$	7,359	⁽¹⁾

Exercisable at September 30, 2015		857		$	10.91		5.5	$	6,549	⁽¹⁾

⁽¹⁾	The intrinsic value is the amount by which the market price of our stock was greater than the exercise price of any individual option grant at September 30, 2015.

Investment in Non-Consolidated Joint Venture (Tables)

9 Months Ended

Sep. 30, 2015

Equity Method Investments and Joint Ventures [Abstract]

Components of Joint Venture Investment

Below are the components of our JV investment balance at September 30, 2015:


January 1, 2015	$	34,703
Capital contributed to the joint venture		1,999
Our share of cumulative earnings		3,957
Dividends Received		(2,868	)
Accretion of basis difference from purchase accounting		(703	)

September 30, 2015	$	37,088

Summarized Balance Sheet Information for Joint Venture

Set forth below is summarized balance sheet information for the JV:


	September 30, 2015		December 31, 2014
Current assets	$	23,230	$	24,140
Non-current assets		24,117		21,519

Total assets	$	47,347	$	45,659

Current liabilities	$	11,333	$	14,162

Total liabilities	$	11,333	$	14,162

Interest Rate Hedging (Tables)

9 Months Ended

Sep. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Effect of Financial Assets and Liabilities Valued on Recurring Basis

The table below summarizes the fair value measurements of the gross asset and liability of this swap as of September 30, 2015, valued on a recurring basis:


(Dollars in thousands)				Fair Value Measurements at September 30, 2015
Description	September 30, 2015			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Derivative asset	$	1,609		$	—	$	1,609		$	—
Derivative liability		(5,084	)		—		(5,084	)		—

	$	(3,475	)	$	—	$	(3,475	)	$	—

Effect of Derivatives' Hedging Relationships

Derivatives’ Hedging Relationships


(Dollars in thousands)	Amount of after tax of gain/ (loss) recognized in Other Comprehensive Income on Derivatives (effective portion)						Location of gain/(loss) reclassified from Accumulated Other Comprehensive Income into Income (effective portion)		Pre-tax amount of gain/(loss) reclassified from Accumulated Other Comprehensive Income into Income (effective portion)
Derivatives’ Cash Flow Hedging Relationships	September 30, 2015			December 31, 2014					September 30, 2015		December 31, 2014
Forward starting interest rate swap contract	$	(3,475	)	$	(431	)		Interest Expense	$	—	$	—

	$	(3,475	)	$	(431	)			$	—	$	—

Acquisitions - Additional Information (Detail) - USD ($)						3 Months Ended		9 Months Ended
	May 29, 2015	Sep. 30, 2014	Aug. 29, 2014	Jun. 20, 2014	Jan. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Intangible assets subject to acquisition						$ 57,226,000		$ 57,226,000
Purchase price allocation, goodwill						85,447,000		85,447,000		$ 83,941,000
Business acquisition, transaction costs						3,948,000	$ 5,651,000	3,948,000	$ 7,080,000
Items include transaction, integration, and financing related costs incurred							8,509,000		8,933,000
Operating assets acquired in cash								$ 9,017,000	259,504,000
Autocam [Member]
Business Acquisition [Line Items]
Date of acquisition								Aug. 29, 2014
Payments to acquire			$ 256,837,000
Purchase price allocation, property plant and equipment			146,120,000
Intangible assets subject to acquisition			51,098,000
Purchase price allocation, goodwill			77,548,000
Business acquisition, debt and capital lease obligations			29,160,000
Business acquisition, consideration transferred in NN stock			31,717,000
Loans payable			$ 350,000,000
Goodwill expected to be deducted for tax purpose						0		$ 0
Business acquisition, transaction costs							5,316,000		5,857,000
Business acquisition, deferred financing costs write off							2,974,000		2,974,000
Increase in cost of sales							1,992,000
Items include transaction, integration, and financing related costs incurred							$ 3,010,000		$ 3,125,000
Caprock [Member]
Business Acquisition [Line Items]
Date of acquisition								May 29, 2015
Payments to acquire	$ 9,000,000
Purchase price allocation, net working capital	1,452,000
Purchase price allocation, property plant and equipment	2,960,000
Intangible assets subject to acquisition	2,490,000					$ 2,490,000		$ 2,490,000
Purchase price allocation, goodwill	$ 2,099,000
VS [Member]
Business Acquisition [Line Items]
Date of acquisition								Jan. 30, 2014
Operating assets acquired in cash					$ 5,580,000
Liabilities assumed					$ 2,968,000
RFK [Member]
Business Acquisition [Line Items]
Date of acquisition								Jun. 20, 2014
Payments to acquire		$ 2,528,000		$ 9,756,000
Percentage of shares acquired				79.20%
Maximum [Member] \| RFK [Member]
Business Acquisition [Line Items]
Percentage of shares acquired		99.70%					99.70%		99.70%

Acquisitions - Summary of Estimated Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Aug. 29, 2014
Business Acquisition [Line Items]
Intangible assets subject to amortization	$ 57,226
Goodwill	$ 85,447	$ 83,941
Autocam [Member]
Business Acquisition [Line Items]
Current assets			$ 88,529
Property, plant, and equipment			146,120
Intangible assets subject to amortization			51,098
Investment in joint venture			35,595
Other non-current assets			2,170
Goodwill			77,548
Total assets acquired			401,060
Current liabilities			34,320
Current maturities of long-term debt			6,547
Non-current deferred tax liabilities			46,998
Obligations under capital lease			18,350
Long-term debt, net of current portion			4,263
Other non-current liabilities			2,028
Total liabilities assumed			112,506
Net asset acquired			$ 288,554

Acquisitions - Summary of Unaudited Proforma Information (Detail) - Autocam [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]
Pro forma sales	$ 166,979	$ 152,708	$ 505,891	$ 457,466
Pro forma net income	$ 4,867	$ 5,436	$ 19,815	$ (224)

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 40,543	$ 35,191
Work in process	20,519	21,883
Finished goods	31,517	34,395
Inventories	$ 92,579	$ 91,469

Inventories - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventory on consignment at customers' location	$ 3,872	$ 5,857

Net Income Per Share - Summary of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income (loss)	$ 4,630	$ (3,840)	$ 17,584	$ 6,599
Weighted average shares outstanding	26,839	17,979	20,122	17,749
Effective of dilutive stock options	328		345	371
Diluted shares outstanding	27,167	17,979	20,467	18,120
Basic net income (loss) per share	$ 0.17	$ (0.21)	$ 0.87	$ 0.36
Diluted net income (loss) per share	$ 0.17	$ (0.21)	$ 0.86	$ 0.36

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Income Per Share - Additional Information (Detail) - shares		3 Months Ended		9 Months Ended
	Jul. 01, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Anti-dilutive options		0	0	0	0
Number of shares of common stock sold	7,590,000	7,590,000

Segment Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenues from external customers	$ 154,824	$ 125,632	$ 483,425	$ 334,840
Income (loss) from operations	10,122	2,552	37,645	19,127
Total assets	719,476	713,139	719,476	713,139	$ 712,713
Metal Bearing Components Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	60,545	69,575	203,041	213,513
Income (loss) from operations	6,633	7,644	25,125	25,164
Total assets	209,120	216,527	209,120	216,527
Autocam Precision Components Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	83,243	46,637	252,336	95,642
Income (loss) from operations	10,894	5,515	27,707	10,724
Total assets	431,478	447,946	431,478	447,946
Plastic and Rubber Components Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	11,036	9,420	28,048	25,685
Income (loss) from operations	595	178	1,309	827
Total assets	28,808	18,157	28,808	18,157
Corporate and Consolidations [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(8,000)	(10,785)	(16,496)	(17,588)
Total assets	$ 50,070	$ 30,509	$ 50,070	$ 30,509

Long-Term Debt and Short-Term Debt - Summary of Long-Term Debt and Short-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt	$ 206,033	$ 350,186
Less current maturities of long-term debt	21,677	22,160
Long-term debt, excluding current maturities of long-term debt	184,356	328,026
French Safeguard [Member]
Debt Instrument [Line Items]
French Safeguard obligations	2,363	2,560
Brazilian [Member]
Debt Instrument [Line Items]
Borrowings under line of credit	917	5,304
Chinese [Member]
Debt Instrument [Line Items]
Borrowings under line of credit	3,761	2,317
Term Loan B [Member]
Debt Instrument [Line Items]
Borrowings under our $350,000 Term Loan B bearing interest at the greater of 1% or 3 month LIBOR (0.283% at September 30, 2015) plus an applicable margin of 5.00% at September 30, 2015 expiring August 29, 2021, net of discount of $4,432.	$ 198,992	$ 340,005

Long-Term Debt and Short-Term Debt - Summary of Long-Term Debt and Short-Term Debt (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2015 USD ($)
Term Loan B [Member]
Debt Instrument [Line Items]
Borrowings	$ 350,000,000
LIBOR rate	0.283%
Applicable margin	5.00%
Interest bearing rate	1.00%
LIBOR Period	3 months
Debt maturity date	Aug. 29, 2021
Debt discount	$ 4,432,000
ABL Revolver [Member]
Debt Instrument [Line Items]
Borrowings	$ 100,000,000
LIBOR rate	0.187%
Applicable margin	1.75%
Debt maturity date	Aug. 29, 2019

Long-Term Debt and Short-Term Debt - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
French Safeguard [Member]
Line of Credit Facility [Line Items]
Interest rate	0.00%
French Safeguard obligations	$ 2,363,000	$ 2,560,000
Current maturities of French Safeguard obligations	304,000
Noncurrent maturities of French Safeguard obligations	$ 2,059,000
Chinese [Member]
Line of Credit Facility [Line Items]
Lines of credit annual interest rate	4.95%
Term Loan B [Member]
Line of Credit Facility [Line Items]
Borrowings	$ 350,000,000
Maturity period	7 years
Repayment of term loan, percentage	5.00%
Potential to expand credit facility under credit agreement	$ 50,000,000
Unamortized balance	$ 8,092,000
ABL Revolver [Member]
Line of Credit Facility [Line Items]
Maturity period	5 years
Repayment of term loan, percentage	1.75%
Potential to expand credit facility under credit agreement	$ 50,000,000
Unamortized balance	1,132,000
Borrowings	100,000,000
ABL borrowing	$ 8,000,000
Minimum [Member] \| French Safeguard [Member]
Line of Credit Facility [Line Items]
Creditor's claim period	10 years
Minimum [Member] \| Brazilian [Member]
Line of Credit Facility [Line Items]
Lines of credit annual interest rate	2.50%
Maximum [Member] \| Brazilian [Member]
Line of Credit Facility [Line Items]
Lines of credit annual interest rate	9.10%

Goodwill, net - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 83,941
Goodwill acquired in acquisition	2,099
Currency translation impacts	(593)
Ending Balance	85,447
Metal Bearing Components Segment [Member]
Goodwill [Line Items]
Beginning Balance	9,949
Currency translation impacts	(593)
Ending Balance	9,356
Autocam Precision Components Segment [Member]
Goodwill [Line Items]
Beginning Balance	73,992
Ending Balance	73,992
Plastic and Rubber Components Segment [Member]
Goodwill [Line Items]
Goodwill acquired in acquisition	2,099
Ending Balance	$ 2,099

Goodwill, net - Additional Information (Detail)	9 Months Ended
Goodwill, net - Additional Information (Detail)	Sep. 30, 2015 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of goodwill	$ 0

Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	May 29, 2015
Intangible Assets [Line Items]
Intangible assets subject to acquisition	$ 57,226
Amortization of intangible assets	4,090
Amortization expense	3,013
Accumulated amortization	5,397
Caprock [Member]
Intangible Assets [Line Items]
Intangible assets subject to acquisition	2,490	$ 2,490
Amortization of intangible assets	203
Amortization expense	88
Customer Relationship [Member] \| Caprock [Member]
Intangible Assets [Line Items]
Intangible assets subject to acquisition	$ 2,430
Preliminary estimated intangible assets useful life	12 years
Trade Name [Member] \| Caprock [Member]
Intangible Assets [Line Items]
Intangible assets subject to acquisition	$ 60
Preliminary estimated intangible assets useful life	1 year

Shared-Based Compensation - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 2,919	$ 1,825
Number of options granted			55	98
Expenses related to issuance of restricted stock			$ 1,747	$ 951
Non-Executive Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock issue			1 year
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units issued			115	97
Restricted Stock [Member] \| Officers and Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock issue			3 years	3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 456	$ 0
Stock units issued			70
Compensation expense period			3 years
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 716	997
Selling, General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1,148	$ 661	$ 2,919	$ 1,948

Shared-Based Compensation - Reconciliation of Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

9 Months Ended

Sep. 30, 2015

Sep. 30, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Number of options, Outstanding, Beginning Balance

1,175

Number of Options, Granted

Number of Options, Exercised

(160)

Number of Options, Forfeited or expired

(3)

Number of Options, Outstanding, Ending Balance

1,067

Number of Options, Options Exercisable

857

Weighted-Average Exercise Price, Outstanding, Beginning Balance

$ 11.40

Weighted-Average Exercise Price, Granted

25.16

Weighted-Average Exercise Price, Exercised

11.49

Weighted-Average Exercise Price, Forfeited or expired

13.12

Weighted-Average Exercise Price, Outstanding, Ending Balance

12.08

Weighted-Average Exercise Price, Options exercisable

$ 10.91

Weighted-Average Remaining Contractual Term, Outstanding, Ending Balance

6 years 1 month 6 days

Weighted- Average Remaining Contractual Term, Options exercisable

5 years 6 months

Aggregate Intrinsic Value, Outstanding, Ending Balance

^[1]

$ 7,359

Aggregate Intrinsic Value, Options exercisable

^[1]

$ 6,549

[1]	The intrinsic value is the amount by which the market price of our stock was greater than the exercise price of any individual option grant at September 30, 2015.

Provision for Income Taxes - Additional Information (Detail)	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
State and Local effective income tax rate	21.00%	40.00%
U.S. federal statutory rate	34.00%		34.00%
Non-U.S. based earnings being taxed at lower rates reducing the effective rate	(8.00%)		(6.00%)
Impact of non-deductible merger and acquisition expenses increasing the tax rate			12.00%

Commitments and Contingencies - Additional Information (Detail)	Sep. 30, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Possible loss estimated minimum	$ 0
Possible loss estimated maximum	6,000,000
Amount accrued for estimation of loss	$ 0

Investment in Non-Consolidated Joint Venture - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Net sales	$ 154,824,000	$ 125,632,000	$ 483,425,000	$ 334,840,000
Net income	$ 4,630,000	$ (3,840,000)	$ 17,584,000	$ 6,599,000
Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Acquired investment in joint venture	49.00%		49.00%
Autocam [Member]
Schedule of Equity Method Investments [Line Items]
Dividend declared by joint venture	$ 2,868,000		$ 2,868,000
Net sales	42,000		106,000
Amount due from joint venture	$ 202,000		202,000
Autocam [Member] \| Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Net sales			35,833,000		$ 50,466,000
Net income			$ 7,228,000		$ 9,004,000

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Investment in Non-Consolidated Joint Venture - Components of Joint Venture Investment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]
Beginning Balance			$ 34,703
Capital contributed to the joint venture			(869)	$ (2,538)
Our share of cumulative earnings	$ 621	$ 225	2,503	$ 225
Ending Balance	37,088		37,088
Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Beginning Balance			34,703
Capital contributed to the joint venture			1,999
Our share of cumulative earnings			3,957
Dividends Received			(2,868)
Accretion of basis difference from purchase accounting			(703)
Ending Balance	$ 37,088		$ 37,088

Investment in Non-Consolidated Joint Venture - Summarized Balance Sheet Information for Joint Venture (Detail) - Joint Venture [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Current assets	$ 23,230	$ 24,140
Non-current assets	24,117	21,519
Total assets	47,347	45,659
Current liabilities	11,333	14,162
Total liabilities	$ 11,333	$ 14,162

- Definition

The amount of current liabilities reported by an equity method investment of the entity.

+ References + Details

- Definition

The amount of noncurrent assets reported by an equity method investment of the entity.

+ References + Details

Interest Rate Hedging - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 16, 2014	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of interest rate swap	$ 150,000
Description of term of interest rate swap	On December 16, 2014, we entered into a $150,000 interest rate swap that will go into effect on December 29, 2015 (one year delayed start), at which time our interest rate will be locked at 7.216% until December 31, 2018.
Locked interest rate	7.216%
Derivative maturity date	Dec. 31, 2018
Derivative inception date	Dec. 29, 2015
Derivative in Net liability position		$ 3,475

Interest Rate Hedging - Financial Assets and Liabilities Valued on Recurring Basis (Detail) $ in Thousands	Sep. 30, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Derivative asset	$ 1,609
Derivative liability	(5,084)
Derivative asset and liability, Total	(3,475)
Significant Other Observable Inputs Level 2 [Member]
Derivatives, Fair Value [Line Items]
Derivative asset	1,609
Derivative liability	(5,084)
Derivative asset and liability, Total	$ (3,475)

Interest Rate Hedging - Derivatives' Cash Flow Hedging Relationships (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of after tax of gain/(loss) recognized in Other Comprehensive Income on Derivatives (effective portion)	$ (3,475)	$ (431)
Pre-tax amount of gain/(loss) reclassified from Accumulated Other Comprehensive Income into Income (effective portion)	0	0
Interest Expense [Member] \| Forward Starting Interest Rate Swap Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of after tax of gain/(loss) recognized in Other Comprehensive Income on Derivatives (effective portion)	(3,475)	(431)
Pre-tax amount of gain/(loss) reclassified from Accumulated Other Comprehensive Income into Income (effective portion)	$ 0	$ 0

Equity Offering - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended	9 Months Ended
	Jul. 01, 2015	Sep. 30, 2015	Sep. 30, 2015
Equity Offering [Abstract]
Number of shares of common stock sold	7,590	7,590
Public offering price per share	$ 24.00
Net proceeds to NN from the offering	$ 173,052
Repayment of term loan and ABL facilities		$ 148,739	$ 149,530

Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands	Oct. 19, 2015	Dec. 31, 2015
Scenario, Forecast [Member] \| Autocam Precision Components Segment [Member] \| Wheeling [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Restructuring charges		$ 6,000
Scenario, Forecast [Member] \| Autocam Precision Components Segment [Member] \| Wheeling [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Restructuring charges		$ 4,500
Subsequent Event [Member] \| Precision Engineered Products [Member]
Subsequent Event [Line Items]
Business acquisition, purchase price	$ 615,000
Subsequent Event [Member] \| Precision Engineered Products [Member] \| Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Applicable margin (as a percent)	3.50%
Revolving loan credit facility	$ 100,000
Subsequent Event [Member] \| Term Loan Credit Facility [Member] \| Precision Engineered Products [Member]
Subsequent Event [Line Items]
Term loan credit facility interest rate	1.00%
Applicable margin (as a percent)	4.75%
Subsequent Event [Member] \| Term Loan Credit Facility [Member] \| Precision Engineered Products [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Loans payable	$ 525,000
Subsequent Event [Member] \| Private Placement [Member] \| 10.25% Senior Notes Due 2020 [Member]
Subsequent Event [Line Items]
Loans payable	$ 300,000
Debt instrument, interest rate	10.25%