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Employee Savings Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Employee Savings Plans [Line Items] |  |  |
Labor and Related Expense | $ 5.3 us-gaap_LaborAndRelatedExpense | $ 4.4 us-gaap_LaborAndRelatedExpense | $ 3.1 us-gaap_LaborAndRelatedExpense

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- Definition The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_LaborAndRelatedExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | wnc_EmployeeSavingsPlansLineItems
Namespace Prefix: | wnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration