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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue:
Advisory fees	$ 59,869us-gaap_InvestmentAdvisoryFees	$ 42,609us-gaap_InvestmentAdvisoryFees
Other income	272us-gaap_OtherIncome	311us-gaap_OtherIncome
Total revenues	60,141us-gaap_Revenues	42,920us-gaap_Revenues
Expenses:
Compensation and benefits	19,601us-gaap_LaborAndRelatedExpense	9,355us-gaap_LaborAndRelatedExpense
Fund management and administration	10,168us-gaap_AssetManagementCosts	9,168us-gaap_AssetManagementCosts
Marketing and advertising	3,076us-gaap_MarketingAndAdvertisingExpense	2,578us-gaap_MarketingAndAdvertisingExpense
Sales and business development	1,900us-gaap_BusinessDevelopment	1,301us-gaap_BusinessDevelopment
Professional and consulting fees	1,463us-gaap_ProfessionalFees	1,795us-gaap_ProfessionalFees
Occupancy, communications, and equipment	918us-gaap_CommunicationsInformationTechnologyAndOccupancy	900us-gaap_CommunicationsInformationTechnologyAndOccupancy
Depreciation and amortization	220us-gaap_DepreciationAndAmortization	192us-gaap_DepreciationAndAmortization
Third party sharing arrangements	283wetf_ThirdPartySharingArrangements	10wetf_ThirdPartySharingArrangements
Acquisition contingent payment	257us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Other	1,235us-gaap_OtherExpenses	1,142us-gaap_OtherExpenses
Total expenses	39,121us-gaap_OperatingExpenses	26,441us-gaap_OperatingExpenses
Income before taxes	21,020us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	16,479us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense/(benefit)	8,958us-gaap_IncomeTaxExpenseBenefit	(13,725)us-gaap_IncomeTaxExpenseBenefit
Net income	$ 12,062us-gaap_NetIncomeLoss	$ 30,204us-gaap_NetIncomeLoss
Net income per share-basic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic
Net income per share-diluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted
Weighted-average common shares-basic	134,075us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	130,934us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted-average common shares-diluted	137,311us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	138,667us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Cash dividends declared per common share	$ 0.08us-gaap_CommonStockDividendsPerShareDeclared

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Balance Type:	debit
Period Type:	duration