Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	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