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v2.4.1.9

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 | $ 344,367 us-gaap_DebtInstrumentFaceAmount | $ 344,490 us-gaap_DebtInstrumentFaceAmount
Unamortized discount of liability component | (15,309)us-gaap_DebtInstrumentUnamortizedDiscount | (19,217)us-gaap_DebtInstrumentUnamortizedDiscount
Less: current portion | 2,429 us-gaap_LongTermDebtCurrent | 496 us-gaap_LongTermDebtCurrent
Long-term debt | 326,629 us-gaap_LongTermDebt | 324,777 us-gaap_LongTermDebt
Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Principal amount of the Notes outstanding | 150,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember | 150,000 us-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 | 135,638 us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember | 134,601 us-gaap_ConvertibleNotesPayable / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember
Less: current portion | 0 us-gaap_LongTermDebtCurrent / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember | 0 us-gaap_LongTermDebtCurrent / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember
Long-term debt | 135,638 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember | 134,601 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember
Carrying value of equity component, net of issuance costs | $ 20,993 us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_DebtInstrumentAxis = wnc_ConvertibleSeniorNotesMember | $ 20,993 us-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

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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