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Computation of Basic and Diluted Net Income Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basic net income per share
Net income applicable to common stockholders																	$ 60,930us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 46,529us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 105,631us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Undistributed earnings allocated to participating securities																	(481)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	(457)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	(904)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Net income applicable to common stockholders excluding amounts applicable to participating securities																	60,449wnc_NetIncomeLossAvailableToCommonStockholdersExcludingUndistributedEarningsAllocatedToParticipatingSecuritiesBasic	46,072wnc_NetIncomeLossAvailableToCommonStockholdersExcludingUndistributedEarningsAllocatedToParticipatingSecuritiesBasic	104,727wnc_NetIncomeLossAvailableToCommonStockholdersExcludingUndistributedEarningsAllocatedToParticipatingSecuritiesBasic
Weighted average common shares outstanding																	68,895us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	68,460us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	68,325us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net income per share	$ 0.28us-gaap_EarningsPerShareBasic		$ 0.26us-gaap_EarningsPerShareBasic		$ 0.23us-gaap_EarningsPerShareBasic		$ 0.11us-gaap_EarningsPerShareBasic		$ 0.15us-gaap_EarningsPerShareBasic		$ 0.24us-gaap_EarningsPerShareBasic		$ 0.20us-gaap_EarningsPerShareBasic		$ 0.08us-gaap_EarningsPerShareBasic		$ 0.88us-gaap_EarningsPerShareBasic	$ 0.67us-gaap_EarningsPerShareBasic	$ 1.53us-gaap_EarningsPerShareBasic
Diluted net income per share:
Net income applicable to common stockholders																	60,930us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	46,529us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	105,631us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Undistributed earnings allocated to participating securities																	(481)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	(457)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	(904)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted
Net income applicable to common stockholders excluding amounts applicable to participating securities																	$ 60,449wnc_NetIncomeLossAvailableToCommonStockholdersExcludingUndistributedEarningsAllocatedToParticipatingSecuritiesDilluted	$ 46,072wnc_NetIncomeLossAvailableToCommonStockholdersExcludingUndistributedEarningsAllocatedToParticipatingSecuritiesDilluted	$ 104,727wnc_NetIncomeLossAvailableToCommonStockholdersExcludingUndistributedEarningsAllocatedToParticipatingSecuritiesDilluted
Weighted average common shares outstanding																	68,895us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	68,460us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	68,325us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive shares from assumed conversion of convertible senior notes																	1,354us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities	63us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities	0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Dilutive stock options and restricted stock																	814us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	558us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	239us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted average common shares outstanding																	71,063us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	69,081us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	68,564us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net income per share	$ 0.27us-gaap_EarningsPerShareDiluted	[1]	$ 0.25us-gaap_EarningsPerShareDiluted	[1]	$ 0.23us-gaap_EarningsPerShareDiluted	[1]	$ 0.10us-gaap_EarningsPerShareDiluted	[1]	$ 0.15us-gaap_EarningsPerShareDiluted	[1]	$ 0.23us-gaap_EarningsPerShareDiluted	[1]	$ 0.20us-gaap_EarningsPerShareDiluted	[1]	$ 0.08us-gaap_EarningsPerShareDiluted	[1]	$ 0.85us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 1.53us-gaap_EarningsPerShareDiluted
[1] Basic and diluted net income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly net income per share may differ from annual net income per share due to rounding.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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