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Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 | May 08, 2012
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Intangible assets purchase price allocation |  | $ 162,800
Backlog |  |
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Intangible assets preliminarily, Amount |  | 900
Intangible assets preliminarily UsefulLife | Less than 1 year |
Tradenames and Trademarks |  |
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Intangible assets preliminarily, Amount |  | 27,600
Intangible assets preliminarily, UsefulLife | 20 years |
Technology |  |
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Intangible assets preliminarily, Amount |  | 15,300
Intangible assets preliminarily, UsefulLife | 12 years |
Customer relationships |  |
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Intangible assets preliminarily, Amount |  | $ 119,000
Intangible assets preliminarily, UsefulLife | 10 years |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Details
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Period Type: | duration

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- Definition Acquired Finite lived Intangible Asset Weighted Average Useful Lives. + 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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Namespace Prefix: | wnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Intangible assets purchase price allocation. + References No definition available. + Details
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Namespace Prefix: | wnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant