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Commitments and Contingencies - Schedule of Future Minimum Lease Payments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
2015 $ 3,200us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 2,905us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 2,778us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 and thereafter 32,414wetf_OperatingLeasesFutureMinimumPaymentsDueInYearFourAndThereafter
Total $ 41,297us-gaap_OperatingLeasesFutureMinimumPaymentsDue