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Income Taxes - Income Tax Expense (Benefit) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
U.S. Federal     $ (115)us-gaap_CurrentFederalTaxExpenseBenefit
State 37us-gaap_CurrentStateAndLocalTaxExpenseBenefit 179us-gaap_CurrentStateAndLocalTaxExpenseBenefit 345us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 7,082us-gaap_CurrentForeignTaxExpenseBenefit 4,490us-gaap_CurrentForeignTaxExpenseBenefit 2,910us-gaap_CurrentForeignTaxExpenseBenefit
Total current expense 7,119us-gaap_CurrentIncomeTaxExpenseBenefit 4,669us-gaap_CurrentIncomeTaxExpenseBenefit 3,140us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
U.S. Federal 1,625us-gaap_DeferredFederalIncomeTaxExpenseBenefit 3,594us-gaap_DeferredFederalIncomeTaxExpenseBenefit 2,789us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State (382)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 145us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 12us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
U.S. deferred tax valuation allowance (1,434)nnbr_DeferredIncomeTaxExpenseBenefitValuationAllowance (818)nnbr_DeferredIncomeTaxExpenseBenefitValuationAllowance (9,814)nnbr_DeferredIncomeTaxExpenseBenefitValuationAllowance
Foreign (1,142)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 410us-gaap_DeferredForeignIncomeTaxExpenseBenefit (54)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred expense (benefit) (1,333)us-gaap_DeferredIncomeTaxExpenseBenefit 3,331us-gaap_DeferredIncomeTaxExpenseBenefit (7,067)us-gaap_DeferredIncomeTaxExpenseBenefit
Total expense (benefit) $ 5,786us-gaap_IncomeTaxExpenseBenefit $ 8,000us-gaap_IncomeTaxExpenseBenefit $ (3,927)us-gaap_IncomeTaxExpenseBenefit