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Equity and Liability Components of Notes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt gross	$ 344,490us-gaap_DebtInstrumentFaceAmount	$ 387,042us-gaap_DebtInstrumentFaceAmount
Unamortized discount of liability component	(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
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
Unamortized discount of liability component	(15,399)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember	(19,372)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember
Net carrying amount of liability component	134,601us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember	130,628us-gaap_LongTermDebt / 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
Carrying value of equity component, net of issuance costs	$ 20,993us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember	$ 20,993us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember
Remaining amortization period of discount on the liability component	3 years 3 months 18 days	4 years 3 months 18 days

X

- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

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-Publisher FASB

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-SubTopic 20

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- Definition

Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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