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Long-Term Debt and Short-Term Debt - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]    
Interest rate 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage  
French Safeguard [Member]    
Line of Credit Facility [Line Items]    
French Safeguard obligations 2,269us-gaap_NotesPayable
/ us-gaap_StatementGeographicalAxis
= country_FR
$ 2,560us-gaap_NotesPayable
/ us-gaap_StatementGeographicalAxis
= country_FR
Current maturities of French Safeguard obligations (293)us-gaap_NotesPayableCurrent
/ us-gaap_StatementGeographicalAxis
= country_FR
 
Noncurrent maturities of French Safeguard obligations (1,976)us-gaap_LongTermNotesPayable
/ us-gaap_StatementGeographicalAxis
= country_FR
 
Chinese [Member]    
Line of Credit Facility [Line Items]    
Annual interest rate 4.95%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_StatementGeographicalAxis
= country_CN
 
Term Loan B [Member]    
Line of Credit Facility [Line Items]    
Borrowings 350,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= nnbr_TermLoanBMember
 
Maturity period 7 years  
Repayment of term loan, percentage 5.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= nnbr_TermLoanBMember
 
Potential to expand credit facility under credit agreement 50,000nnbr_PotentialToExpandCreditFacilityUnderCreditAgreement
/ us-gaap_CreditFacilityAxis
= nnbr_TermLoanBMember
 
Unamortized balance 8,772us-gaap_DeferredFinanceCostsNet
/ us-gaap_CreditFacilityAxis
= nnbr_TermLoanBMember
 
ABL Revolver [Member]    
Line of Credit Facility [Line Items]    
Maturity period 5 years  
Repayment of term loan, percentage 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= nnbr_AssetBackedRevolvingCreditFacilityMember
 
Potential to expand credit facility under credit agreement 50,000nnbr_PotentialToExpandCreditFacilityUnderCreditAgreement
/ us-gaap_CreditFacilityAxis
= nnbr_AssetBackedRevolvingCreditFacilityMember
 
Unamortized balance 1,222us-gaap_DeferredFinanceCostsNet
/ us-gaap_CreditFacilityAxis
= nnbr_AssetBackedRevolvingCreditFacilityMember
 
Borrowings 100,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= nnbr_AssetBackedRevolvingCreditFacilityMember
 
ABL borrowing 8,000nnbr_LineOfCreditFacilityCovenantComplianceAmount
/ us-gaap_CreditFacilityAxis
= nnbr_AssetBackedRevolvingCreditFacilityMember
 
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 interest rate 2.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= country_BR
 
Maximum [Member] | Brazilian [Member]    
Line of Credit Facility [Line Items]    
Lines of credit interest rate 22.40%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= country_BR