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Equity and Liability Components of Notes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Principal amount of the Notes outstanding	$ 344,367us-gaap_DebtInstrumentFaceAmount	$ 344,490us-gaap_DebtInstrumentFaceAmount
Unamortized discount of liability component	(15,309)us-gaap_DebtInstrumentUnamortizedDiscount	(19,217)us-gaap_DebtInstrumentUnamortizedDiscount
Less: current portion	2,429us-gaap_LongTermDebtCurrent	496us-gaap_LongTermDebtCurrent
Long-term debt	326,629us-gaap_LongTermDebt	324,777us-gaap_LongTermDebt
Convertible Senior Notes
Debt Instrument [Line Items]
Principal amount of the Notes outstanding	150,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember	150,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember
Unamortized discount of liability component	(14,362)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember	(15,399)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember
Net carrying amount of liability component	135,638us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember	134,601us-gaap_ConvertibleNotesPayable / 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	135,638us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember	134,601us-gaap_LongTermDebt / 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 1 month 6 days	3 years 3 months 18 days

X

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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X

- Definition

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

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X

- 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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- Definition

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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