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Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	0 Months Ended	3 Months Ended
	Mar. 31, 2014	Jan. 30, 2014	Mar. 31, 2015
Business Acquisition [Line Items]
Operating assets acquired in cash	$ 7,312us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
VS [Member]
Business Acquisition [Line Items]
Operating assets acquired in cash		5,580us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember
Liabilities assumed		$ 2,968us-gaap_LiabilitiesAssumed1 / us-gaap_BusinessAcquisitionAxis = nnbr_VsIndustriesVsPrecisionLlcAndVsPrecisionSaDeDvMember
Date of acquisition			Jan. 30, 2014

X

- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 6

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- Definition

The fair value of liabilities assumed in noncash investing or financing activities.

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- Definition

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+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6516133



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