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Financial Assets and Liabilities Accounted For at Fair Value on Recurring Basis (Detail) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | $ 335,914 us-gaap_Liabilities | $ 332,527 us-gaap_Liabilities
Convertible senior notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 135,638 us-gaap_Liabilities / us-gaap_LineOfCreditFacilityAxis = wnc_ConvertibleSeniorNotesMember | 134,601 us-gaap_Liabilities / us-gaap_LineOfCreditFacilityAxis = wnc_ConvertibleSeniorNotesMember
Term loan credit agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 191,898 us-gaap_Liabilities / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember | 189,027 us-gaap_Liabilities / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember
Industrial revenue bond |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 1,522 us-gaap_Liabilities / us-gaap_LineOfCreditFacilityAxis = wnc_BondFinancingMember | 1,645 us-gaap_Liabilities / us-gaap_LineOfCreditFacilityAxis = wnc_BondFinancingMember
Capital lease obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 6,856 us-gaap_Liabilities / us-gaap_LineOfCreditFacilityAxis = us-gaap_CapitalLeaseObligationsMember | 7,254 us-gaap_Liabilities / us-gaap_LineOfCreditFacilityAxis = us-gaap_CapitalLeaseObligationsMember
Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | Convertible senior notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_LineOfCreditFacilityAxis = wnc_ConvertibleSeniorNotesMember | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_LineOfCreditFacilityAxis = wnc_ConvertibleSeniorNotesMember
Fair Value, Inputs, Level 1 | Term loan credit agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember
Fair Value, Inputs, Level 1 | Industrial revenue bond |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_LineOfCreditFacilityAxis = wnc_BondFinancingMember | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_LineOfCreditFacilityAxis = wnc_BondFinancingMember
Fair Value, Inputs, Level 1 | Capital lease obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_LineOfCreditFacilityAxis = us-gaap_CapitalLeaseObligationsMember | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_LineOfCreditFacilityAxis = us-gaap_CapitalLeaseObligationsMember
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 393,353 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 381,335 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | Convertible senior notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 199,785 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LineOfCreditFacilityAxis = wnc_ConvertibleSeniorNotesMember | 188,490 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LineOfCreditFacilityAxis = wnc_ConvertibleSeniorNotesMember
Fair Value, Inputs, Level 2 | Term loan credit agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 193,568 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember | 192,845 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember
Fair Value, Inputs, Level 2 | Industrial revenue bond |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LineOfCreditFacilityAxis = wnc_BondFinancingMember | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LineOfCreditFacilityAxis = wnc_BondFinancingMember
Fair Value, Inputs, Level 2 | Capital lease obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LineOfCreditFacilityAxis = us-gaap_CapitalLeaseObligationsMember | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LineOfCreditFacilityAxis = us-gaap_CapitalLeaseObligationsMember
Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 8,378 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 8,899 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | Convertible senior notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LineOfCreditFacilityAxis = wnc_ConvertibleSeniorNotesMember | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LineOfCreditFacilityAxis = wnc_ConvertibleSeniorNotesMember
Fair Value, Inputs, Level 3 | Term loan credit agreement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember
Fair Value, Inputs, Level 3 | Industrial revenue bond |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | 1,522 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LineOfCreditFacilityAxis = wnc_BondFinancingMember | 1,645 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LineOfCreditFacilityAxis = wnc_BondFinancingMember
Fair Value, Inputs, Level 3 | Capital lease obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities, fair value disclosure, recurring | $ 6,856 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LineOfCreditFacilityAxis = us-gaap_CapitalLeaseObligationsMember | $ 7,254 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_LineOfCreditFacilityAxis = us-gaap_CapitalLeaseObligationsMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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