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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	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 61,051us-gaap_NetIncomeLoss	$ 51,537us-gaap_NetIncomeLoss	$ 11,030us-gaap_NetIncomeLoss
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	131,770us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	126,651us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	122,138us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options and unvested restricted stock	6,781wetf_DilutiveStockOptionsAndUnvestedRestrictedStock	13,146wetf_DilutiveStockOptionsAndUnvestedRestrictedStock	15,830wetf_DilutiveStockOptionsAndUnvestedRestrictedStock
Weighted averages shares used in dilutive computation	138,551us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	139,797us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	137,968us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic
Dilutive earnings per share	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.08us-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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