XML 101 R85.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Income Taxes - Summary of Activity in Total Valuation Allowances (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Balance at Beginning of Year | $ 1,400 | $ 1,434 | $ 2,252
Additions | $ 0 | 0 | 0
Recoveries |  | (1,434) | (818)
Balance at End of Year |  | $ 1,400 | $ 1,434

X
- Definition Deferred tax assets valuation allowance additions. + References No definition available. + Details
Name: | nnbr_DeferredTaxAssetsValuationAllowanceAdditions
Namespace Prefix: | nnbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Deferred tax assets valuation recoveries. + References No definition available. + Details
Name: | nnbr_DeferredTaxAssetsValuationRecoveries
Namespace Prefix: | nnbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration