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Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income	$ 12,062us-gaap_NetIncomeLoss	$ 30,204us-gaap_NetIncomeLoss
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	134,075us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	130,934us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options and unvested restricted stock	3,236wetf_DilutiveStockOptionsAndUnvestedRestrictedStock	7,733wetf_DilutiveStockOptionsAndUnvestedRestrictedStock
Weighted averages shares used in dilutive computation	137,311us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	138,667us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic
Dilutive earnings per share	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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