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Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets    
Tax credits and loss carryforwards $ 2,550us-gaap_DeferredTaxAssetsTaxCreditCarryforwards $ 7,452us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Accrued liabilities 6,882wnc_DeferredTaxAssetsAccruedLiabilities 6,964wnc_DeferredTaxAssetsAccruedLiabilities
Incentive compensation 17,171wnc_DeferredTaxAssetsIncentiveCompensation 16,621wnc_DeferredTaxAssetsIncentiveCompensation
Other 5,551us-gaap_DeferredTaxAssetsOther 4,736us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross 32,154us-gaap_DeferredTaxAssetsGross 35,773us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities    
Property, plant and equipment (2,858)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (295)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangibles (5,565)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (4,993)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Prepaid assets (638)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses (690)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Convertible note discount (5,117)wnc_DeferredTaxLiabilitiesConvertibleNoteDiscount (6,585)wnc_DeferredTaxLiabilitiesConvertibleNoteDiscount
Other (2,025)us-gaap_DeferredTaxLiabilitiesOther (29)us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liability (16,203)us-gaap_DeferredIncomeTaxLiabilities (12,592)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset before valuation allowances and reserves 15,951us-gaap_DeferredTaxAssetsValuationAllowance 23,181us-gaap_DeferredTaxAssetsValuationAllowance
Valuation allowances (1,307)us-gaap_DeferredTaxAssetsNet (1,438)us-gaap_DeferredTaxAssetsNet
Net deferred tax asset $ 14,644us-gaap_DeferredTaxAssetsLiabilitiesNet $ 21,743us-gaap_DeferredTaxAssetsLiabilitiesNet