XML 33 R52.htm IDEA: XBRL DOCUMENT v2.4.1.9
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 $ 344,490,000us-gaap_DebtInstrumentFaceAmount $ 387,042,000us-gaap_DebtInstrumentFaceAmount          
Notes initial conversion price     $ 11.70us-gaap_DebtInstrumentConvertibleConversionPrice1        
Proceeds from notes issued 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 292,500,000us-gaap_ProceedsFromIssuanceOfLongTermDebt        
Current portion of long-term debt 496,000us-gaap_LongTermDebtCurrent 3,245,000us-gaap_LongTermDebtCurrent          
Debt issuance costs paid 0us-gaap_PaymentsOfDebtIssuanceCosts 981,000us-gaap_PaymentsOfDebtIssuanceCosts 5,134,000us-gaap_PaymentsOfDebtIssuanceCosts        
Interest expense 22,165,000us-gaap_InterestExpense 26,308,000us-gaap_InterestExpense 21,724,000us-gaap_InterestExpense        
Line of credit facility, decrease, repayments 806,000us-gaap_RepaymentsOfLinesOfCredit 1,166,000us-gaap_RepaymentsOfLinesOfCredit 271,015,000us-gaap_RepaymentsOfLinesOfCredit        
Loan Agreement              
Debt Instrument [Line Items]              
Long-term debt gross             2,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_StatementClassOfStockAxis
= wnc_LoanAgreementMember
Notes issued, interest rate             4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_StatementClassOfStockAxis
= wnc_LoanAgreementMember
Long-term debt 1,600,000us-gaap_LongTermDebt
/ us-gaap_StatementClassOfStockAxis
= wnc_LoanAgreementMember
           
Current portion of long-term debt 500,000us-gaap_LongTermDebtCurrent
/ us-gaap_StatementClassOfStockAxis
= wnc_LoanAgreementMember
           
Convertible Senior Notes              
Debt Instrument [Line Items]              
Long-term debt gross 150,000,000us-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         150,000,000us-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 85.4372us-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 1,000wnc_PrincipalAmountPerNoteUsedInConversionRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_ShortTermDebtTypeAxis
= wnc_ConvertibleSeniorNotesMember
           
Notes initial conversion price $ 11.70us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_ShortTermDebtTypeAxis
= wnc_ConvertibleSeniorNotesMember
           
Convertible notes, conversation date Nov. 01, 2017            
Proceeds from notes issued 1,000us-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 123,800,000us-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 21,700,000us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_ShortTermDebtTypeAxis
= wnc_ConvertibleSeniorNotesMember
           
Proceeds from issuance of convertible senior notes 145,500,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_ShortTermDebtTypeAxis
= wnc_ConvertibleSeniorNotesMember
           
Debt Conversion, Converted Instrument, Amount 8,000,000us-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 145,100,000us-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 10,000,000us-gaap_InterestPaid
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
14,900,000us-gaap_InterestPaid
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
10,900,000us-gaap_InterestPaid
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
       
Debt issuance costs paid 8,500,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
           
Interest expense 900,000us-gaap_InterestExpense
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
900,000us-gaap_InterestExpense
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
600,000us-gaap_InterestExpense
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
       
Other Expenses 900,000us-gaap_OtherExpenses
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
1,400,000us-gaap_OtherExpenses
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
         
Amended Credit Agreement | Loan Agreement              
Debt Instrument [Line Items]              
Long-term debt gross 42,100,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
/ us-gaap_StatementClassOfStockAxis
= wnc_LoanAgreementMember
62,800,000us-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 289,900,000us-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 150,000,000us-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 25,000,000us-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 200,000,000us-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 10,000,000us-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 192,845,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= wnc_TermLoanCreditFaciltyMember
234,923,000us-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 1,000,000us-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       300,000,000us-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       75,000,000us-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           297,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= wnc_TermLoanCreditFaciltyMember
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
 
Long-term debt           277,000,000us-gaap_LongTermDebt
/ us-gaap_LineOfCreditFacilityAxis
= wnc_TermLoanCreditFaciltyMember
/ us-gaap_LongtermDebtTypeAxis
= wnc_AmendedCreditAgreementMember
 
Line of credit facility, decrease, repayments           20,000,000us-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 $ 15,000,000us-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 1.0wnc_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 1.0wnc_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 1.0wnc_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 1.0wnc_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 1.1wnc_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 4.5wnc_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 4.0wnc_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 3.5wnc_SeniorLeverageRatio
/ us-gaap_LineOfCreditFacilityAxis
= wnc_TermLoanCreditFaciltyMember
/ us-gaap_LongtermDebtTypeAxis
= wnc_ThereafterMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember