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Reportable Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net sales
Total net sales	$ 437,597us-gaap_SalesRevenueNet	$ 358,120us-gaap_SalesRevenueNet
Income (Loss) from operations	27,263us-gaap_OperatingIncomeLoss	19,465us-gaap_OperatingIncomeLoss
Reconciling items to income before income taxes
Interest expense	(5,173)us-gaap_InterestExpense	(5,717)us-gaap_InterestExpense
Loss on debt extinguishment	(5,286)us-gaap_GainsLossesOnExtinguishmentOfDebt	0us-gaap_GainsLossesOnExtinguishmentOfDebt
Other, net	(96)us-gaap_OtherNonoperatingIncomeExpense	32us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	16,708us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	13,780us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
External customers
Net sales
Total net sales	437,597us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_ExternalCustomersMember	358,120us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_ExternalCustomersMember
Intersegment sales
Net sales
Total net sales	0us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_IntersegmentSalesMember	0us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_IntersegmentSalesMember
Commercial Trailer Products
Net sales
Total net sales	314,504us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember	227,951us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
Income (Loss) from operations	22,770us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember	8,760us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
Commercial Trailer Products | External customers
Net sales
Total net sales	293,742us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember	207,498us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
Commercial Trailer Products | Intersegment sales
Net sales
Total net sales	20,762us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_IntersegmentSalesMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember	20,453us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_IntersegmentSalesMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
Diversified Products
Net sales
Total net sales	103,992us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember	108,053us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
Income (Loss) from operations	10,611us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember	13,397us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
Diversified Products | External customers
Net sales
Total net sales	101,041us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember	105,263us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
Diversified Products | Intersegment sales
Net sales
Total net sales	2,951us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_IntersegmentSalesMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember	2,790us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_IntersegmentSalesMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
Retail
Net sales
Total net sales	43,140us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember	45,636us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
Income (Loss) from operations	1,126us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember	1,050us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
Retail | External customers
Net sales
Total net sales	42,814us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember	45,359us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_ExternalCustomersMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
Retail | Intersegment sales
Net sales
Total net sales	326us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_IntersegmentSalesMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember	277us-gaap_SalesRevenueNet / us-gaap_MajorCustomersAxis = wnc_IntersegmentSalesMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
Corporate and Eliminations
Net sales
Total net sales	(24,039)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember	(23,520)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Income (Loss) from operations	(7,244)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember	(3,742)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Corporate and Eliminations | External customers
Net sales
Total net sales	0us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = wnc_ExternalCustomersMember	0us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = wnc_ExternalCustomersMember
Corporate and Eliminations | Intersegment sales
Net sales
Total net sales	$ (24,039)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = wnc_IntersegmentSalesMember	$ (23,520)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = wnc_IntersegmentSalesMember

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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