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Self-Insurance Accrual Included In Other Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Other Accrued Liabilities [Line Items] |  |
Beginning Balance | $ 9,419 us-gaap_SelfInsuranceReserve | $ 7,711 us-gaap_SelfInsuranceReserve
Expense | 35,555 wnc_ExpensesFromSelfInsurance | 38,467 wnc_ExpensesFromSelfInsurance
Payments | (37,431)wnc_PaymentsForSelfInsurance | (36,759)wnc_PaymentsForSelfInsurance
Ending Balance | $ 7,543 us-gaap_SelfInsuranceReserve | $ 9,419 us-gaap_SelfInsuranceReserve

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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SelfInsuranceReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Expenses from self insurance + References No definition available. + Details
Name: | wnc_ExpensesFromSelfInsurance
Namespace Prefix: | wnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Payments for self insurance. + References No definition available. + Details
Name: | wnc_PaymentsForSelfInsurance
Namespace Prefix: | wnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration