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Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) Financial_Institution	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Financial_Institution Segment	Jun. 30, 2014 USD ($)	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	$ 81,320	$ 43,938	$ 141,189	$ 86,547
Number of operating segments | Segment			1
Boost Issuer PLC [Member]
Related Party Transaction [Line Items]
Accounts receivable related-party	722		$ 722		$ 157
ETF advisory fee revenue	911	185	1,434	185
Wisdom Tree Issuer Plc [Member]
Related Party Transaction [Line Items]
Accounts receivable related-party	722		722		157
ETF advisory fee revenue	911	185	1,434	185
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
Accounts receivable related-party	27,127		27,127		$ 17,288
ETF advisory fee revenue	$ 80,409	$ 43,753	$ 139,755	$ 86,362

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