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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Aug. 13, 2020	Jun. 16, 2020
Assets:
Securities owned, at fair value	$ 119,390	$ 34,895
Liabilities:
Deferred consideration (Note )	224,953	230,137
Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	20,143	660
Total	139,533	35,555
Liabilities:
Deferred consideration (Note )	224,953	230,137
Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member]
Assets:
Securities owned, at fair value	21,454	24,165
Fair Value, Measurements, Recurring [Member] | Federal Agency [Member]
Assets:
Securities owned, at fair value	95,785	8,613
Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member]
Assets:
Securities owned, at fair value	2,151	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	20,143	660
Total	66,566	24,825
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member]
Assets:
Securities owned, at fair value	21,454	24,165
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Federal Agency [Member]
Assets:
Securities owned, at fair value	24,969
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member]
Assets:
Securities owned, at fair value	0
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	72,967	10,730
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Federal Agency [Member]
Assets:
Securities owned, at fair value	70,816	8,613
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member]
Assets:
Securities owned, at fair value	2,151	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]
Liabilities:
Deferred consideration (Note )	224,953	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 portion 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.

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Fair value portion of notes payable.

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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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