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Long-Term Debt and Short-Term Debt - Summary of Long-Term Debt and Short-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total debt $ 358,243us-gaap_LongTermDebt $ 350,186us-gaap_LongTermDebt
Less current maturities of long-term debt 23,248us-gaap_LongTermDebtCurrent 22,160us-gaap_LongTermDebtCurrent
Long-term debt, net of current portion 334,995us-gaap_LongTermDebtNoncurrent 328,026us-gaap_LongTermDebtNoncurrent
French Safeguard [Member]    
Debt Instrument [Line Items]    
French Safeguard obligations 2,269us-gaap_NotesPayable
/ us-gaap_StatementGeographicalAxis
= country_FR
2,560us-gaap_NotesPayable
/ us-gaap_StatementGeographicalAxis
= country_FR
Brazilian [Member]    
Debt Instrument [Line Items]    
Borrowings under line of credit 5,049us-gaap_LineOfCredit
/ us-gaap_StatementGeographicalAxis
= country_BR
5,304us-gaap_LineOfCredit
/ us-gaap_StatementGeographicalAxis
= country_BR
Chinese [Member]    
Debt Instrument [Line Items]    
Borrowings under line of credit 3,108us-gaap_LineOfCredit
/ us-gaap_StatementGeographicalAxis
= country_CN
2,317us-gaap_LineOfCredit
/ us-gaap_StatementGeographicalAxis
= country_CN
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 (0.27% at March 31, 2015) plus an applicable margin of 5.00% at March 31, 2015 expiring August 29, 2021, net of discount of $4,807. 335,817us-gaap_LoansPayable
/ us-gaap_CreditFacilityAxis
= nnbr_TermLoanBMember
340,005us-gaap_LoansPayable
/ us-gaap_CreditFacilityAxis
= nnbr_TermLoanBMember
ABL Revolver [Member]    
Debt Instrument [Line Items]    
Borrowings under line of credit $ 12,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= nnbr_AssetBackedRevolvingCreditFacilityMember