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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Self-Insurance Accrual Included In Other Accrued Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Self Insurance Reserve [Roll Forward] |  |
Balance as of January 1 | $ 9,996 | $ 8,387
Expense | 66,493 | 38,817
Supreme Acquisition | 0 | 2,555
Payments | (66,599) | (39,763)
Balance as of December 31 | $ 9,890 | $ 9,996

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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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition The amount of increase in self insurance reserve from business acquisition. + References No definition available. + Details
Name: | wnc_IncreaseInSelfInsuranceReserveFromBusinessAcquisition
Namespace Prefix: | wnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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

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- Definition Self Insurance Reserve [Roll Forward] + References No definition available. + Details
Name: | wnc_SelfInsuranceReserveRollForward
Namespace Prefix: | wnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration