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Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) Financial_Institution	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Financial_Institution Segment	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Related Party Transaction [Line Items]
Cash and cash equivalents maturity period, maximum			90 days
Number of financial institutions | Financial_Institution	1		1
ETF advisory fee revenue	$ 80,520	$ 46,942	$ 221,709	$ 133,489
Number of operating segments | Segment			1
Boost Issuer PLC [Member]
Related Party Transaction [Line Items]
Accounts receivable related-party	824		$ 824		$ 157
ETF advisory fee revenue	1,278	282	2,712	467
Wisdom Tree Issuer Plc [Member]
Related Party Transaction [Line Items]
Accounts receivable related-party	824		824		157
ETF advisory fee revenue	1,278	282	2,712	467
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
Accounts receivable related-party	23,917		23,917		$ 17,288
ETF advisory fee revenue	$ 79,242	$ 46,660	$ 218,997	$ 133,022

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-SubTopic 10



-Section S99



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