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Major Product Categories and Percentage of Consolidated Net Sales (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Product Information [Line Items] |  |  |
Net external sales | $ 1,863,315 us-gaap_Revenues | $ 1,635,686 us-gaap_Revenues | $ 1,461,854 us-gaap_Revenues
Percentage of consolidated net sales | 100.00%us-gaap_ConcentrationRiskPercentage1 | 100.00%us-gaap_ConcentrationRiskPercentage1 | 100.00%us-gaap_ConcentrationRiskPercentage1
Commercial Trailer Products |  |  |
Product Information [Line Items] |  |  |
Net external sales | 1,221,040 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 1,010,736 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 995,164 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
Diversified Products |  |  |
Product Information [Line Items] |  |  |
Net external sales | 453,160 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 444,804 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 309,680 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
Retail |  |  |
Product Information [Line Items] |  |  |
Net external sales | 189,115 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 180,146 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 157,010 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
New Trailers |  |  |
Product Information [Line Items] |  |  |
Net external sales | 1,493,825 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember | 1,246,923 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember | 1,163,854 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember
Percentage of consolidated net sales | 80.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember | 76.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember | 79.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember
New Trailers | Commercial Trailer Products |  |  |
Product Information [Line Items] |  |  |
Net external sales | 1,177,402 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 959,116 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 959,094 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
New Trailers | Diversified Products |  |  |
Product Information [Line Items] |  |  |
Net external sales | 227,382 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 204,812 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 131,236 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
New Trailers | Retail |  |  |
Product Information [Line Items] |  |  |
Net external sales | 89,041 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 82,995 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 73,524 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductOneMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
Used Trailers |  |  |
Product Information [Line Items] |  |  |
Net external sales | 45,115 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember | 49,415 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember | 40,183 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember
Percentage of consolidated net sales | 2.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember | 3.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember | 2.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember
Used Trailers | Commercial Trailer Products |  |  |
Product Information [Line Items] |  |  |
Net external sales | 23,576 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 33,443 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 23,534 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember
Used Trailers | Diversified Products |  |  |
Product Information [Line Items] |  |  |
Net external sales | 4,593 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 3,158 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 1,887 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
Used Trailers | Retail |  |  |
Product Information [Line Items] |  |  |
Net external sales | 16,946 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 12,814 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 14,762 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductTwoMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
Components, parts and service |  |  |
Product Information [Line Items] |  |  |
Net external sales | 170,589 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember | 180,326 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember | 131,747 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember
Percentage of consolidated net sales | 9.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember
Components, parts and service | Commercial Trailer Products |  |  |
Product Information [Line Items] |  |  |
Net external sales | 3,077 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 7,387 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 2,323 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 | 87,942 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 92,869 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 64,145 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 | 79,570 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 80,070 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 65,279 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductThreeMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
Equipment and other |  |  |
Product Information [Line Items] |  |  |
Net external sales | 153,786 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember | 159,022 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember | 126,070 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember
Percentage of consolidated net sales | 8.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember | 9.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember | 8.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember
Equipment and other | Commercial Trailer Products |  |  |
Product Information [Line Items] |  |  |
Net external sales | 16,985 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 10,790 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_CommercialVehicleSegmentMember | 10,213 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 | 133,243 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 143,965 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember | 112,412 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_OtherProductsMember
Equipment and other | Retail |  |  |
Product Information [Line Items] |  |  |
Net external sales | $ 3,558 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | $ 4,267 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | $ 3,445 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = wnc_ProductFourMember / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember

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