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Calculation of Average Diluted Shares Outstanding (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock options and restricted stock	0	0	336
Redeemable warrants	0	0	12,890
Options to purchase common shares	1,676	1,376	1,437

X

- Definition

Additional shares excluded in the calculation of diluted EPS as a result of the potentially dilutive effect of options to purchase common shares.

+ References

No definition available.

+ Details

Name:	wnc_AntiDilutiveSecuritiesOptionsToPurchaseCommonSharesExcludedFromComputationOfEarningsPerShare
Namespace Prefix:	wnc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Additional shares excluded in the calculation of diluted EPS as a result of the potentially dilutive effect of redeemable warrants.

+ References

No definition available.

+ Details

Name:	wnc_AntiDilutiveSecuritiesRedeemableWarrantsExcludedFromComputationOfEarningsPerShare
Namespace Prefix:	wnc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Additional shares excluded in the calculation of diluted EPS as a result of the potentially dilutive effect of stock options and restricted stock.

+ References

No definition available.

+ Details

Name:	wnc_AntiDilutiveSecuritiesStockOptionsAndRestrictedStockExcludedFromComputationOfEarningsPerShare
Namespace Prefix:	wnc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration