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Income Taxes - Schedule of Annual Limitations for Net Operating Losses (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items] |  |  |  |
Total | $ 109,839us-gaap_OperatingLossCarryforwards | $ 140,959us-gaap_OperatingLossCarryforwards | $ 136,515us-gaap_OperatingLossCarryforwards | $ 106,939us-gaap_OperatingLossCarryforwards
Annual Prospective Limitation | 524wetf_NetOperatingLossAnnualLimitation |  |  |
Annual Deemed Worthless | 3,487wetf_NetOperatingLossAmountDeemedWorthless |  |  |
1998 - 2004 [Member] |  |  |  |
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items] |  |  |  |
Total | 8,731us-gaap_OperatingLossCarryforwards / us-gaap_CreationDateAxis = wetf_NineteenNinetyEightToTwoThousandFourMember |  |  |
Annual Prospective Limitation | 524wetf_NetOperatingLossAnnualLimitation / us-gaap_CreationDateAxis = wetf_NineteenNinetyEightToTwoThousandFourMember |  |  |
Annual Deemed Worthless | 3,487wetf_NetOperatingLossAmountDeemedWorthless / us-gaap_CreationDateAxis = wetf_NineteenNinetyEightToTwoThousandFourMember |  |  |
2005 - 2013 [Member] |  |  |  |
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items] |  |  |  |
Total | $ 101,108us-gaap_OperatingLossCarryforwards / us-gaap_CreationDateAxis = wetf_TwoThousandFiveToTwoThousandThirteenMember |  |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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