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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Accounting Policies [Line Items]        
Prepaid Expense, Current $ 10,200,000us-gaap_PrepaidExpenseCurrent $ 9,600,000us-gaap_PrepaidExpenseCurrent    
General And Administrative Expenses Cost Of Goods Sold Depreciation 16,500,000wnc_GeneralAndAdministrativeExpensesCostOfGoodsSoldDepreciation 15,700,000wnc_GeneralAndAdministrativeExpensesCostOfGoodsSoldDepreciation 12,700,000wnc_GeneralAndAdministrativeExpensesCostOfGoodsSoldDepreciation  
Capital Leases, Balance Sheet, Assets by Major Class, Net 10,200,000us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet 10,900,000us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet    
Amortization Of Intangible Assets 21,878,000us-gaap_AmortizationOfIntangibleAssets 21,786,000us-gaap_AmortizationOfIntangibleAssets 10,590,000us-gaap_AmortizationOfIntangibleAssets  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation 4,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation      
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 3,700,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation 2,400,000us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation    
Estimated amortization expense for 2015 21,300,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths      
Estimated amortization expense for 2016 20,100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo      
Estimated amortization expense for 2017 16,900,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree      
Estimated amortization expense for 2018 15,500,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour      
Estimated amortization expense for 2019 14,600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive      
Research and Development Expense 1,700,000us-gaap_ResearchAndDevelopmentExpense 2,200,000us-gaap_ResearchAndDevelopmentExpense 1,700,000us-gaap_ResearchAndDevelopmentExpense  
Capitalized Computer Software, Net 2,200,000us-gaap_CapitalizedComputerSoftwareNet 200,000us-gaap_CapitalizedComputerSoftwareNet    
Capitalized Computer Software, Amortization 500,000us-gaap_CapitalizedComputerSoftwareAmortization 700,000us-gaap_CapitalizedComputerSoftwareAmortization 2,300,000us-gaap_CapitalizedComputerSoftwareAmortization  
Retail        
Accounting Policies [Line Items]        
Disposal Group, Including Discontinued Operation, Goodwill       500,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1
/ us-gaap_StatementBusinessSegmentsAxis
= wnc_RetailMember
Goodwill, Period Increase (Decrease) 9,900,000us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= wnc_RetailMember		 9,900,000us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= wnc_RetailMember		    
Used Trailers        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Additions 26,800,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= wnc_UsedTrailersMember		 26,200,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= wnc_UsedTrailersMember		 19,500,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= wnc_UsedTrailersMember		  
Accounts Payable, Trade 10,000,000us-gaap_AccountsPayableTradeCurrentAndNoncurrent
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= wnc_UsedTrailersMember		 15,600,000us-gaap_AccountsPayableTradeCurrentAndNoncurrent
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= wnc_UsedTrailersMember		    
Property Plant And Equipment Net Realizable Value $ 10,000,000wnc_PropertyPlantAndEquipmentNetRealizableValue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= wnc_UsedTrailersMember		 $ 15,300,000wnc_PropertyPlantAndEquipmentNetRealizableValue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= wnc_UsedTrailersMember		    
Building and Building Improvements        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life 33 years      
Machinery and Equipment | Maximum        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life 10 years      
Machinery and Equipment | Minimum        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life 3 years      
Software | Maximum        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life 7 years      
Software | Minimum        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life 3 years