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

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