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Purchase Price Allocation (Detail) (Walker Group Holdings Llc [Member], USD $) In Thousands, unless otherwise specified	May 08, 2012
Walker Group Holdings Llc [Member]
Business Combination Allocation Of Purchase Price [Line Items]
Cash	$ 10,982wnc_BusinessAcquisitionsPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember
Current assets	93,409wnc_BusinessAcquisitionsPurchasePriceAllocationCurrentAssets / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember
Property, plant and equipment	32,541wnc_BusinessAcquisitionPurchasesPriceAllocationPropertyPlantAndEquipment / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember
Intangibles	162,800wnc_BusinessAcquisitionPurchasesPriceAllocationIntangibleAssetsOtherThanGoodwill / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember
Deferred income taxes	4,640wnc_BusinessAcquisitionPurchasesPriceAllocationDeferredTaxAssetsNoncurrent / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember
Goodwill	148,498wnc_BusinessAcquisitionPurchasesPriceAllocationGoodwillAmount / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember
Total assets	452,870wnc_BusinessAcquisitionPurchasesPriceAllocationAssetsAcquired / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember
Current liabilities	(74,722)wnc_BusinessAcquisitionPurchasesPriceAllocationCurrentLiabilities / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember
Deferred income taxes	(1,100)wnc_BusinessAcquisitionPurchasesPriceAllocationDeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember
Total liabilities	(75,822)wnc_BusinessAcquisitionPurchasesPriceAllocationLiabilitiesAssumed / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net	377,048wnc_BusinessAcquisitionPurchasesPriceAllocationAssetsAcquiredLiabilitiesAssumedNet / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember
Acquisition, net of cash acquired	$ 366,066wnc_BusinessAcquisitionsCostOfAcquiredEntityPurchasePrice / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember

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