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Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Acquired Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]  
Intangible Assets Purchase Price Allocation $ 162,800wnc_IntangibleAssetsPurchasePriceAllocation
Trademarks and Trade Names [Member]  
Acquired Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]  
Intangible Assets Purchase Price Allocation 27,600wnc_IntangibleAssetsPurchasePriceAllocation
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Acquired Finite lived Intangible Asset Weighted Average Useful Lives 20 years
Technology-Based Intangible Assets [Member]  
Acquired Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]  
Intangible Assets Purchase Price Allocation 15,300wnc_IntangibleAssetsPurchasePriceAllocation
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Acquired Finite lived Intangible Asset Weighted Average Useful Lives 12 years
Customer Relationships [Member]  
Acquired Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]  
Intangible Assets Purchase Price Allocation 119,000wnc_IntangibleAssetsPurchasePriceAllocation
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Acquired Finite lived Intangible Asset Weighted Average Useful Lives 10 years
Order or Production Backlog [Member]  
Acquired Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]  
Intangible Assets Purchase Price Allocation $ 900wnc_IntangibleAssetsPurchasePriceAllocation
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember
Acquired Finite lived Intangible Asset Weighted Average Useful Lives Less than 1 year