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Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) Financial_Institution Segment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 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 | $ 297,944 | $ 182,816 | $ 148,594
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 | 3,872 |
Boost Issuer PLC [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable related-party | 487 | 157 |
ETF advisory fee revenue | 4,156 | 829 |
Wisdom Tree Issuer Plc [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable related-party | 487 | 157 |
ETF advisory fee revenue | 4,156 | 829 |
WisdomTree Trust [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable related-party | 24,560 | 17,288 |
ETF advisory fee revenue | $ 293,788 | $ 181,987 | $ 148,594

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