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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014
Accounting Policies [Line Items] |  |  |  |
Prepaid Expense, Current | $ 10,200,000 us-gaap_PrepaidExpenseCurrent | $ 9,600,000 us-gaap_PrepaidExpenseCurrent |  |
General And Administrative Expenses Cost Of Goods Sold Depreciation | 16,500,000 wnc_GeneralAndAdministrativeExpensesCostOfGoodsSoldDepreciation | 15,700,000 wnc_GeneralAndAdministrativeExpensesCostOfGoodsSoldDepreciation | 12,700,000 wnc_GeneralAndAdministrativeExpensesCostOfGoodsSoldDepreciation |
Capital Leases, Balance Sheet, Assets by Major Class, Net | 10,200,000 us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet | 10,900,000 us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet |  |
Amortization Of Intangible Assets | 21,878,000 us-gaap_AmortizationOfIntangibleAssets | 21,786,000 us-gaap_AmortizationOfIntangibleAssets | 10,590,000 us-gaap_AmortizationOfIntangibleAssets |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation | 4,300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation |  |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | 3,700,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation | 2,400,000 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation |  |
Estimated amortization expense for 2015 | 21,300,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |
Estimated amortization expense for 2016 | 20,100,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |
Estimated amortization expense for 2017 | 16,900,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |
Estimated amortization expense for 2018 | 15,500,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |
Estimated amortization expense for 2019 | 14,600,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |
Research and Development Expense | 1,700,000 us-gaap_ResearchAndDevelopmentExpense | 2,200,000 us-gaap_ResearchAndDevelopmentExpense | 1,700,000 us-gaap_ResearchAndDevelopmentExpense |
Capitalized Computer Software, Net | 2,200,000 us-gaap_CapitalizedComputerSoftwareNet | 200,000 us-gaap_CapitalizedComputerSoftwareNet |  |
Capitalized Computer Software, Amortization | 500,000 us-gaap_CapitalizedComputerSoftwareAmortization | 700,000 us-gaap_CapitalizedComputerSoftwareAmortization | 2,300,000 us-gaap_CapitalizedComputerSoftwareAmortization |
Retail |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Goodwill |  |  |  | 500,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember
Goodwill, Period Increase (Decrease) | 9,900,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember | 9,900,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = wnc_RetailMember |  |
Used Trailers |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Additions | 26,800,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wnc_UsedTrailersMember | 26,200,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wnc_UsedTrailersMember | 19,500,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wnc_UsedTrailersMember |
Accounts Payable, Trade | 10,000,000 us-gaap_AccountsPayableTradeCurrentAndNoncurrent / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wnc_UsedTrailersMember | 15,600,000 us-gaap_AccountsPayableTradeCurrentAndNoncurrent / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wnc_UsedTrailersMember |  |
Property Plant And Equipment Net Realizable Value | $ 10,000,000 wnc_PropertyPlantAndEquipmentNetRealizableValue / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wnc_UsedTrailersMember | $ 15,300,000 wnc_PropertyPlantAndEquipmentNetRealizableValue / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wnc_UsedTrailersMember |  |
Building and Building Improvements |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 33 years |  |  |
Machinery and Equipment | Maximum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |
Machinery and Equipment | Minimum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |
Software | Maximum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |  |
Software | Minimum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |

X
- Definition Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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- Definition Amount of capital lease obligation, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount classified as goodwill attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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