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Major Product Categories and Percentage of Consolidated Net Sales (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Product Information [Line Items] |  |
Net external sales | $ 437,597 us-gaap_Revenues | $ 358,120 us-gaap_Revenues
Percentage of consolidated net sales | 100.00%us-gaap_ConcentrationRiskPercentage1 | 100.00%us-gaap_ConcentrationRiskPercentage1
Commercial Trailer Products |  |
Product Information [Line Items] |  |
Net external sales | 293,742 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 207,498 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
Diversified Products |  |
Product Information [Line Items] |  |
Net external sales | 101,041 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 105,263 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
Retail |  |
Product Information [Line Items] |  |
Net external sales | 42,814 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 45,359 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
New Trailers |  |
Product Information [Line Items] |  |
Net external sales | 361,271 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember | 268,118 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember
Percentage of consolidated net sales | 82.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember | 74.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember
New Trailers | Commercial Trailer Products |  |
Product Information [Line Items] |  |
Net external sales | 287,420 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 193,000 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
New Trailers | Diversified Products |  |
Product Information [Line Items] |  |
Net external sales | 54,017 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 54,847 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
New Trailers | Retail |  |
Product Information [Line Items] |  |
Net external sales | 19,834 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 20,271 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
Used Trailers |  |
Product Information [Line Items] |  |
Net external sales | 5,583 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember | 16,065 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember
Percentage of consolidated net sales | 1.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember | 4.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember
Used Trailers | Commercial Trailer Products |  |
Product Information [Line Items] |  |
Net external sales | 1,843 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 11,248 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
Used Trailers | Diversified Products |  |
Product Information [Line Items] |  |
Net external sales | 1,169 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 1,178 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
Used Trailers | Retail |  |
Product Information [Line Items] |  |
Net external sales | 2,571 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 3,639 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
Components, parts and service |  |
Product Information [Line Items] |  |
Net external sales | 41,816 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember | 41,698 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember
Percentage of consolidated net sales | 9.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember | 11.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember
Components, parts and service | Commercial Trailer Products |  |
Product Information [Line Items] |  |
Net external sales | 1,266 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 580 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
Components, parts and service | Diversified Products |  |
Product Information [Line Items] |  |
Net external sales | 20,609 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 20,420 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
Components, parts and service | Retail |  |
Product Information [Line Items] |  |
Net external sales | 19,941 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 20,698 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
Equipment and other |  |
Product Information [Line Items] |  |
Net external sales | 28,927 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember | 32,239 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember
Percentage of consolidated net sales | 6.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember
Equipment and other | Commercial Trailer Products |  |
Product Information [Line Items] |  |
Net external sales | 3,213 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 2,670 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
Equipment and other | Diversified Products |  |
Product Information [Line Items] |  |
Net external sales | 25,246 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 28,818 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
Equipment and other | Retail |  |
Product Information [Line Items] |  |
Net external sales | $ 468 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | $ 751 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember

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