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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
	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

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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