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ETF Shareholder Proxy Solicitation - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Equity [Abstract]  
Percentage of common stock own by beneficial owner 25.50%wetf_PercentageOfCommonStockOwnByBeneficialOwner
Reduced percentage of common stock owned by beneficial owner due to sell or transfer 25.00%wetf_ReducedPercentageOfCommonStockOwnByBeneficialOwnerDueToSellOrTransfer
Threshold percentage of ownership presumes change in control 25.00%wetf_ThresholdPercentageOfOwnershipPresumesChangeInControl
ETF shareholders proxy $ 3,264wetf_EtfShareholderProxy