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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 08, 2021	Dec. 31, 2020	Aug. 13, 2020	Jun. 16, 2020
Assets:
Securities owned, at fair value	$ 58,806		$ 34,895
Liabilities:
Deferred consideration (Note 9)	226,706		230,137
Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	81,536		660
Total	140,342		35,555
Liabilities:
Deferred consideration (Note 9)	226,706		230,137
Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member]
Assets:
Securities owned, at fair value	21,623		24,165
Fair Value, Measurements, Recurring [Member] | Federal Agency [Member]
Assets:
Securities owned, at fair value	35,033		8,613
Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member]
Assets:
Securities owned, at fair value	2,150		2,117
Fair Value, Measurements, Nonrecurring [Member]
Assets:
AdvisorEngine Inc. – Financial interests			0
Investment owned, at fair value			0
Total			0
Liabilities:
Convertible notes			170,191	$ 24,344	$ 145,847
Fair Value, Measurements, Nonrecurring [Member] | Securrency - Series A convertible preferred stock
Assets:
Investment owned, at fair value		$ 8,488
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	81,536		660
Total	118,140		24,825
Liabilities:
Deferred consideration (Note 9)			0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member]
Assets:
Securities owned, at fair value	21,623		24,165
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Federal Agency [Member]
Assets:
Securities owned, at fair value	14,981
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets:
AdvisorEngine Inc. – Financial interests			0
Investment owned, at fair value			0
Total			0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Total	22,202		10,730
Liabilities:
Deferred consideration (Note 9)			0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Federal Agency [Member]
Assets:
Securities owned, at fair value	20,052		8,613
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member]
Assets:
Securities owned, at fair value	2,150		2,117
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets:
AdvisorEngine Inc. – Financial interests			0
Investment owned, at fair value			0
Total			0
Liabilities:
Convertible notes			170,191
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents			0
Total			0
Liabilities:
Deferred consideration (Note 9)	226,706		230,137
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets:
AdvisorEngine Inc. – Financial interests			0
Investment owned, at fair value			0
Total			$ 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Securrency - Series A convertible preferred stock
Assets:
Investment owned, at fair value	$ 8,488

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model.

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