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Components of Long Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt gross $ 344,490us-gaap_DebtInstrumentFaceAmount $ 387,042us-gaap_DebtInstrumentFaceAmount
Less: unamortized discount (19,217)us-gaap_DebtInstrumentUnamortizedDiscount (24,907)us-gaap_DebtInstrumentUnamortizedDiscount
Less: current portion (496)us-gaap_LongTermDebtCurrent (3,245)us-gaap_LongTermDebtCurrent
LONG-TERM DEBT 324,777us-gaap_LongTermDebtNoncurrent 358,890us-gaap_LongTermDebtNoncurrent
Term loan credit agreement    
Debt Instrument [Line Items]    
Long-term debt gross 192,845us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= wnc_TermLoanCreditFaciltyMember
234,923us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= wnc_TermLoanCreditFaciltyMember
Industrial revenue bond    
Debt Instrument [Line Items]    
Long-term debt gross 1,645us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= wnc_BondFinancingMember
2,119us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= wnc_BondFinancingMember
Convertible Senior Notes    
Debt Instrument [Line Items]    
Long-term debt gross 150,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wnc_ConvertibleSeniorNotesMember
150,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wnc_ConvertibleSeniorNotesMember
Less: unamortized discount (15,399)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= wnc_ConvertibleSeniorNotesMember
(19,372)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= wnc_ConvertibleSeniorNotesMember
Less: current portion 0us-gaap_LongTermDebtCurrent
/ us-gaap_DebtInstrumentAxis
= wnc_ConvertibleSeniorNotesMember
0us-gaap_LongTermDebtCurrent
/ us-gaap_DebtInstrumentAxis
= wnc_ConvertibleSeniorNotesMember
LONG-TERM DEBT $ 134,601us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= wnc_ConvertibleSeniorNotesMember
$ 130,628us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= wnc_ConvertibleSeniorNotesMember