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Commitments and Contingencies - Additional Information (Detail)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jun. 30, 2010
USD ($)
Dec. 31, 2014
BRL
Dec. 31, 2014
USD ($)
May 31, 2012
USD ($)
Nov. 22, 2011
Court-Imposed Interest, Fees or Inflation Adjustments
Maximum
USD ($)
Nov. 22, 2011
Court-Imposed Interest, Fees or Inflation Adjustments
Maximum
BRL
Dec. 31, 2014
Arizona Department Of Environmental Quality
USD ($)
Dec. 31, 2014
Standby Letters Of Credit
USD ($)
Loss Contingencies [Line Items]                
Damages asserted by BK   20.8us-gaap_LossContingencyDamagesSoughtValue     $ 58.0us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= wnc_OtherAdjustmentsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		   $ 0.2us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= wnc_ArizonaDepartmentOfEnvironmentalQualityMember		  
Total ordered damages granted to Bk         10.0us-gaap_LossContingencyDamagesAwardedValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= wnc_OtherAdjustmentsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 26.7us-gaap_LossContingencyDamagesAwardedValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= wnc_OtherAdjustmentsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Business combination, recognized identifiable assets acquired and liabilities assumed, contingent liability       2.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContingentLiability        
Amount of remediation plan for the RID portion of the Superfund Site approved by ADEQ 100wnc_EnvironmentalRemediationCostAmountApproved              
Loss Contingency, Estimate of Possible Loss             0.6us-gaap_LossContingencyEstimateOfPossibleLoss
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= wnc_ArizonaDepartmentOfEnvironmentalQualityMember		  
Letters of Credit Outstanding, Amount               6.2us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember
Purchase Obligation     $ 71.3us-gaap_PurchaseObligation