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Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2014 Financial_Institution | Jun. 30, 2013 | Jun. 30, 2014 Segment Financial_Institution | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014 Boost Issuer PLC [Member] | Jun. 30, 2014 WisdomTree Trust [Member] | Jun. 30, 2013 WisdomTree Trust [Member] | Jun. 30, 2014 WisdomTree Trust [Member] | Jun. 30, 2013 WisdomTree Trust [Member] | Jun. 30, 2014 Foreign Exchange [Member] | Dec. 31, 2013 Foreign Exchange [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents maturity period, maximum |  |  | 90 days |  |  |  |  |  |  |  |  |  |
Number of financial institutions | 1 |  | 1 |  |  |  |  |  |  |  |  |  |
Cash balance in British pounds equivalent to USD, which is subject to exchange rate changes | $ 128,847 | $ 70,733 | $ 128,847 | $ 70,733 | $ 104,316 | $ 41,246 |  |  |  |  |  | $ 1,072 | $ 8,057
Accounts receivable related-party | 14,942 |  | 14,942 |  | 14,791 |  |  |  |  |  |  |  |
ETF advisory fee revenue | $ 43,938 | $ 37,101 | $ 86,547 | $ 66,254 |  |  | $ 185 | $ 43,753 | $ 37,101 | $ 86,362 | $ 66,254 |  |
Number of operating segments |  |  | 1 |  |  |  |  |  |  |  |  |  |

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