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