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Acquisitions - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 08, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 04, 2013
Business Acquisition [Line Items] |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 377,000,000 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |
Intangible Assets Purchase Price Allocation |  | 162,800,000 wnc_IntangibleAssetsPurchasePriceAllocation |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  | 1,597,920,000 us-gaap_BusinessAcquisitionsProFormaRevenue |
Business Combination, Acquisition Related Costs |  | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts | 883,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts | 14,409,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |
Walker Group Holdings LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments To Acquire Businesses Additional Payment | 2,100,000 wnc_PaymentsToAcquireBusinessesAdditionalPayment / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember |  |  |  |
Business Acquisitions Pro Forma Income Before Income Taxes |  |  |  | 34,400,000 wnc_BusinessAcquisitionsProFormaIncomeBeforeIncomeTaxes / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember |
Business Acquisition Purchases Price Allocation Intangible Assets Other Than Goodwill | 162,800,000 wnc_BusinessAcquisitionPurchasesPriceAllocationIntangibleAssetsOtherThanGoodwill / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember |  |  |  |
Business Acquisition Purchases Price Allocation Goodwill Amount | 148,498,000 wnc_BusinessAcquisitionPurchasesPriceAllocationGoodwillAmount / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember |  |  |  |
Payments to Acquire Businesses, Gross | 377,000,000 us-gaap_PaymentsToAcquireBusinessesGross / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember |  |  |  |
Intangible Assets Purchase Price Allocation | 162,800,000 wnc_IntangibleAssetsPurchasePriceAllocation / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | 148,500,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  | 270,100,000 us-gaap_BusinessAcquisitionsProFormaRevenue / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember |
Business Combination, Acquisition Related Costs |  |  | 900,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember | 14,400,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember |
Beall Corporation [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisitions cost of acquired entity purchase price |  |  |  |  | 13,900,000 wnc_BusinessAcquisitionsCostOfAcquiredEntityPrchasePrice / dei_LegalEntityAxis = wnc_BeallCorporationMember
Business Acquisition Purchases Price Allocation Capital Lease Obligation Accrual |  | 4,700,000 wnc_BusinessAcquisitionPurchasesPriceAllocationCapitalLeaseObligationAccrual / dei_LegalEntityAxis = wnc_BeallCorporationMember |  |  |
Business Acquisition Purchases Price Allocation Intangible Assets Other Than Goodwill |  |  |  |  | 8,900,000 wnc_BusinessAcquisitionPurchasesPriceAllocationIntangibleAssetsOtherThanGoodwill / dei_LegalEntityAxis = wnc_BeallCorporationMember
Business Acquisition Purchases Price Allocation Goodwill Amount |  |  |  |  | 1,800,000 wnc_BusinessAcquisitionPurchasesPriceAllocationGoodwillAmount / dei_LegalEntityAxis = wnc_BeallCorporationMember
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  | $ 1,784,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / dei_LegalEntityAxis = wnc_BeallCorporationMember
Convertible Senior Notes | Walker Group Holdings LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = wnc_WalkerGroupHoldingsLlcMember / us-gaap_ShortTermDebtTypeAxis = wnc_ConvertibleSeniorNotesMember |  |  |  |
Debt Instrument Maturity Year | 2018 |  |  |  |

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Business acquisition purchases price allocation capital lease obligation accrual. + References No definition available. + Details
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- Definition Business acquisition purchases price allocation goodwill amount. + References No definition available. + Details
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- Definition Business acquisition purchases price allocation intangible assets other than goodwill. + References No definition available. + Details
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- Definition Business acquisitions cost of acquired entity purchase price. + References No definition available. + Details
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- Definition The pro forma Income before income taxes for the period as if the business combination or combinations had been completed at the beginning of a period. + References No definition available. + Details
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- Definition Payments to acquire businesses additional payment. + References No definition available. + Details
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