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Debt - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 08, 2012 | Apr. 30, 2012 | Apr. 30, 2013 | Nov. 30, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt gross | $ 344,490,000 us-gaap_DebtInstrumentFaceAmount | $ 387,042,000 us-gaap_DebtInstrumentFaceAmount |  |  |  |  |
Notes initial conversion price |  |  | $ 11.70 us-gaap_DebtInstrumentConvertibleConversionPrice1 |  |  |  |
Proceeds from notes issued | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 292,500,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt |  |  |  |
Current portion of long-term debt | 496,000 us-gaap_LongTermDebtCurrent | 3,245,000 us-gaap_LongTermDebtCurrent |  |  |  |  |
Debt issuance costs paid | 0 us-gaap_PaymentsOfDebtIssuanceCosts | 981,000 us-gaap_PaymentsOfDebtIssuanceCosts | 5,134,000 us-gaap_PaymentsOfDebtIssuanceCosts |  |  |  |
Interest expense | 22,165,000 us-gaap_InterestExpense | 26,308,000 us-gaap_InterestExpense | 21,724,000 us-gaap_InterestExpense |  |  |  |
Line of credit facility, decrease, repayments | 806,000 us-gaap_RepaymentsOfLinesOfCredit | 1,166,000 us-gaap_RepaymentsOfLinesOfCredit | 271,015,000 us-gaap_RepaymentsOfLinesOfCredit |  |  |  |
Loan Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  |  |  | 2,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_StatementClassOfStockAxis = wnc_LoanAgreementMember
Notes issued, interest rate |  |  |  |  |  |  | 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_StatementClassOfStockAxis = wnc_LoanAgreementMember
Long-term debt | 1,600,000 us-gaap_LongTermDebt / us-gaap_StatementClassOfStockAxis = wnc_LoanAgreementMember |  |  |  |  |  |
Current portion of long-term debt | 500,000 us-gaap_LongTermDebtCurrent / us-gaap_StatementClassOfStockAxis = wnc_LoanAgreementMember |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt gross | 150,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |  |  |
Convertible Senior Notes | Walker Group Holdings LLC |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes issued, interest rate |  |  |  | 3.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |
Debt Instrument Maturity Year |  |  |  | 2018 |  |  |
Unsecured Debt | Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt gross |  |  |  |  | 150,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |
Notes issued, interest rate |  |  |  |  | 3.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |
Notes issued, interest payment frequency |  |  |  |  | semi-annually |  |
Notes initial conversion rate per 1,000 in principal amount | 85.4372 us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |  |  |
Principal amount of notes conversation for 85.4372 shares of common stock | 1,000 wnc_PrincipalAmountPerNoteUsedInConversionRate / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |  |  |
Notes initial conversion price | $ 11.70 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |  |  |
Convertible notes, conversation date | Nov. 01, 2017 |  |  |  |  |  |
Proceeds from notes issued | 1,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |  |  |
Estimated implied interest rate | 7.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |  |  |
Fair value of liability component upon issuance | 123,800,000 us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |  |  |
Difference between cash proceeds before offering expenses and the estimated fair value of liability component | 21,700,000 us-gaap_DebtInstrumentUnamortizedPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |  |  |
Proceeds from issuance of convertible senior notes | 145,500,000 us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount | 8,000,000 us-gaap_DebtConversionConvertedInstrumentAmount1 / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |  |  |
Debt Instrument Maturity Year |  |  |  |  | 2018 |  |
Unsecured Debt | Convertible Senior Notes | Walker Group Holdings LLC |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of convertible senior notes | 145,100,000 us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |  |  |
Unsecured Debt | Convertible Senior Notes | Scenario 1 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of consecutive trading days |  | 30 days |  |  |  |  |
Convertible senior notes, trading price per $1,000 principal amount of notes as percentage of the product of the last reported sale price of common stock and the conversion rate | 98.00%wnc_TradingPriceOfConvertibleNotesDuringMeasurementPeriodPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember / us-gaap_StatementClassOfStockAxis = wnc_ScenarioOneMember |  |  |  |  |  |
Amended Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Paid | 10,000,000 us-gaap_InterestPaid / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember | 14,900,000 us-gaap_InterestPaid / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember | 10,900,000 us-gaap_InterestPaid / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember |  |  |  |
Debt issuance costs paid | 8,500,000 us-gaap_PaymentsOfDebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember |  |  |  |  |  |
Interest expense | 900,000 us-gaap_InterestExpense / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember | 900,000 us-gaap_InterestExpense / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember | 600,000 us-gaap_InterestExpense / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember |  |  |  |
Other Expenses | 900,000 us-gaap_OtherExpenses / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember | 1,400,000 us-gaap_OtherExpenses / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember |  |  |  |  |
Amended Credit Agreement | Loan Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt gross | 42,100,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember / us-gaap_StatementClassOfStockAxis = wnc_LoanAgreementMember | 62,800,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember / us-gaap_StatementClassOfStockAxis = wnc_LoanAgreementMember |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 289,900,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |
Revolving Credit Facility | Amended and Restated Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, maturity date | May 08, 2017 |  |  |  |  |  |
Credit facility, borrowing capacity | 150,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember |  |  |  |  |  |
Excess availability as a percentage of total revolving commitment below which minimum fixed charge coverage ratio maintained | 12.50%wnc_AvailabilityPercentageThresholdOfTotalRevolvingCommitmentBelowWhichMinimumFixedChargeCoverageRatioIsRequired / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember |  |  |  |  |  |
Availability percentage threshold of total revolving commitment below which amounts in deposit accounts will be transferred daily in to blocked account | 15.00%wnc_AvailabilityPercentageThresholdOfTotalRevolvingCommitmentBelowWhichAmountsInDepositAccountsWillBeTransferredDailyInToBlockedAccount / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding | 25,000,000 us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember |  |  |  |  |  |
Revolving Credit Facility | Amended and Restated Credit Agreement | Option to increase subject to certain conditions |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, borrowing capacity | 200,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember / us-gaap_StatementClassOfStockAxis = wnc_Scenario1Member |  |  |  |  |  |
Revolving Credit Facility | Amended and Restated Credit Agreement | Swing Line Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, borrowing capacity | 10,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtSecurityAxis = wnc_SwinglineLoansMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember |  |  |  |  |  |
Term Loan Credit Facilty |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt gross | 192,845,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember | 234,923,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember |  |  |  |  |
Notes issued, interest rate | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  |  | May 08, 2019 |
Line of credit facility potential term extension period |  |  |  |  |  | 91 days |
Debt amortization percentage |  |  |  |  |  | 1.00%wnc_DebtAmortizationPercentage / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember |
Proceeds from Sale of Productive Assets | 1,000,000 us-gaap_ProceedsFromSaleOfProductiveAssets / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember |  |  |  |  |  |
Percentage of tranche loan amount on equal quarterly installments |  |  |  |  |  | 0.25%wnc_PercentageOfTrancheLoanAmountOnEqualQuarterlyInstallments / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember |
Term Loan Credit Facilty | Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes issued, interest rate |  |  |  |  |  | 3.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |
Term Loan Credit Facilty | Senior Secured Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  | 300,000,000 us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_LongtermDebtTypeAxis = wnc_SeniorSecuredCreditFacilityMember |  |  |
Term Loan Credit Facilty | Incremental Senior Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, borrowing capacity |  |  |  | 75,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_LongtermDebtTypeAxis = wnc_IncrementalSeniorCreditFacilityMember |  |  |
Term Loan Credit Facilty | Amended Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  | 297,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember |
Long-term debt |  |  |  |  |  | 277,000,000 us-gaap_LongTermDebt / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember |
Line of credit facility, decrease, repayments |  |  |  |  |  | 20,000,000 us-gaap_RepaymentsOfLinesOfCredit / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedCreditAgreementMember |
Term Loan Credit Facilty Libor |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, interest rate above basis |  |  |  |  |  | 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyLiborMember |
Term Loan Credit Facilty Base Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, interest rate above basis |  |  |  |  |  | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyBaseRateMember |
Letter Of Credit Subfacility | Revolving Credit Facility | Amended and Restated Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, borrowing capacity | $ 15,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wnc_LetterOfCreditSubfacilityMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember |  |  |  |  |  |
Minimum | Unsecured Debt | Convertible Senior Notes | Scenario 1 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of trading days | 20 days |  |  |  |  |  |
Last reported sale price of common stock as percentage of conversion price | 130.00%wnc_DebtInstrumentConversionCircumstanceCommonStockPriceAsPercentageOfDebtConversionPrice / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember / us-gaap_StatementClassOfStockAxis = wnc_ScenarioOneMember |  |  |  |  |  |
Minimum | Revolving Credit Facility | Amended and Restated Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Required minimum fixed charge coverage ratio when availability under the Revolver is less than 12.5% of the total revolving commitment | 1.0 wnc_FixedChargeCoverageRatioMinimum / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Minimum | Revolving Credit Facility | Amended and Restated Credit Agreement | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, interest rate above basis | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtSecurityAxis = wnc_LondonInterBankOfferedRateMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Minimum | Revolving Credit Facility | Amended and Restated Credit Agreement | Base Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, interest rate above basis | 0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtSecurityAxis = us-gaap_BaseRateMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Minimum | Term Loan Credit Facilty | Through September 30, 2013 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior leverage ratio | 1.0 wnc_SeniorLeverageRatio / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_LongtermDebtTypeAxis = wnc_ThroughSeptemberThirtyTwentyThirteenMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Minimum | Term Loan Credit Facilty | Thereafter through September 30, 2015 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior leverage ratio | 1.0 wnc_SeniorLeverageRatio / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_LongtermDebtTypeAxis = wnc_ThroughSeptemberThirtyTwentyFifteenMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Minimum | Term Loan Credit Facilty | Thereafter |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior leverage ratio | 1.0 wnc_SeniorLeverageRatio / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_LongtermDebtTypeAxis = wnc_ThereafterMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Maximum | Revolving Credit Facility | Amended and Restated Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Required minimum fixed charge coverage ratio when availability under the Revolver is less than 12.5% of the total revolving commitment | 1.1 wnc_FixedChargeCoverageRatioMinimum / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Maximum | Revolving Credit Facility | Amended and Restated Credit Agreement | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, interest rate above basis | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtSecurityAxis = wnc_LondonInterBankOfferedRateMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Maximum | Revolving Credit Facility | Amended and Restated Credit Agreement | Base Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, interest rate above basis | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtSecurityAxis = us-gaap_BaseRateMember / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = wnc_AmendedAndRestatedCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Maximum | Term Loan Credit Facilty | Through September 30, 2013 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior leverage ratio | 4.5 wnc_SeniorLeverageRatio / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_LongtermDebtTypeAxis = wnc_ThroughSeptemberThirtyTwentyThirteenMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Maximum | Term Loan Credit Facilty | Thereafter through September 30, 2015 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior leverage ratio | 4.0 wnc_SeniorLeverageRatio / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_LongtermDebtTypeAxis = wnc_ThroughSeptemberThirtyTwentyFifteenMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Maximum | Term Loan Credit Facilty | Thereafter |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior leverage ratio | 3.5 wnc_SeniorLeverageRatio / us-gaap_LineOfCreditFacilityAxis = wnc_TermLoanCreditFaciltyMember / us-gaap_LongtermDebtTypeAxis = wnc_ThereafterMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_DebtConversionConvertedInstrumentAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The price per share of the conversion feature embedded in the debt instrument. + 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 (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
Name: | us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
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X
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- Definition Latest date when the debt instrument can be converted into equity, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + Details
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- Definition Description of the frequency of periodic payments (monthly, quarterly, annual). + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt premium 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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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: 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) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition 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. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition This element represents a sum total of expenses not separately reflected on the income statement for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4,6) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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