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Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) Financial_Institution Segment | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items] |  |  |
Cash and cash equivalents maturity period, maximum | 90 days |  |
Number of financial institutions | Financial_Institution | 1 |  |
ETF advisory fee revenue | $ 60,615 | $ 59,869 |
Number of operating segments | Segment | 1 |  |
Adjustments for New Accounting Principle, Early Adoption [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Reduction in current assets |  |  | $ 9,279
Boost Issuer PLC [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable related-party | $ 578 |  | 487
ETF advisory fee revenue | 1,523 | 523 |
Wisdom Tree Issuer Plc [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable related-party | 578 |  | 487
ETF advisory fee revenue | 1,523 | 523 |
WisdomTree Trust [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable related-party | 19,663 |  | $ 24,560
ETF advisory fee revenue | $ 58,642 | $ 59,346 |

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