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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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