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v2.4.1.9

Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 Segment Financial_Institution | Mar. 31, 2014 | Dec. 31, 2014
Related Party Transaction [Line Items] |  |  |
Cash and cash equivalents maturity period, maximum | 90 days |  |
Number of financial institutions | 1 wetf_NumberOfFinancialInstitutions |  |
Accounts receivable related-party | $ 23,540 us-gaap_AccountsReceivableRelatedParties |  | $ 17,288 us-gaap_AccountsReceivableRelatedParties
ETF advisory fee revenue | 59,869 us-gaap_InvestmentAdvisoryFees | 42,609 us-gaap_InvestmentAdvisoryFees |
Number of operating segments | 1 us-gaap_NumberOfOperatingSegments |  |
Boost Issuer PLC [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
ETF advisory fee revenue | 523 us-gaap_InvestmentAdvisoryFees / dei_LegalEntityAxis = wetf_BoostIssuerPlcMember |  |
Wisdom Tree Issuer Plc [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
ETF advisory fee revenue | 523 us-gaap_InvestmentAdvisoryFees / dei_LegalEntityAxis = wetf_WisdomTreeIssuerPlcMember |  |
WisdomTree Trust [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
ETF advisory fee revenue | $ 59,346 us-gaap_InvestmentAdvisoryFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wetf_WisdomtreeTrustMember | $ 42,609 us-gaap_InvestmentAdvisoryFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wetf_WisdomtreeTrustMember |

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