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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investments, Owned, Federal Income Tax Note [Line Items]      
Operating Loss Carryforwards, Valuation Allowance     $ 59,900,000us-gaap_OperatingLossCarryforwardsValuationAllowance
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 1,300,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 1,400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal  
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 4,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic    
Unrecognized Tax Benefits 10,648,000us-gaap_UnrecognizedTaxBenefits 10,971,000us-gaap_UnrecognizedTaxBenefits 10,980,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 300,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued $ 400,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Operating Loss Carryforward Expiration Dates expire beginning in 2016, if unused    
Us Federal      
Investments, Owned, Federal Income Tax Note [Line Items]      
Effective income tax rate reconciliation at federal statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= wnc_UsFedralMember		    
Operating Loss Carryforward Expiration Dates 2002 through 2014.    
Indiana State      
Investments, Owned, Federal Income Tax Note [Line Items]      
Operating Loss Carryforward Expiration Dates 2002 through 2014.