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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Jun. 09, 2021	Mar. 08, 2021	Dec. 31, 2020	Aug. 13, 2020	Jun. 16, 2020
Assets:
Securities owned, at fair value	$ 127,166			$ 34,895
Liabilities:
Deferred consideration (Note 10)	228,062			230,137
Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	11,488			660
Total	138,654			35,555
Liabilities:
Deferred consideration (Note 10)	228,062			230,137
Fair Value, Measurements, Recurring [Member] | ETFs [Member]
Assets:
Securities owned, at fair value	18,812			24,165
Fair Value, Measurements, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Securities owned, at fair value	106,245			8,613
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets:
Securities owned, at fair value	2,109			2,117
Fair Value, Measurements, Nonrecurring [Member]
Liabilities:
Convertible notes				170,191	$ 24,344	$ 145,847
Securrency - Series A convertible preferred stock | Fair Value, Measurements, Nonrecurring [Member]
Assets:
Investment owned, at fair value	8,488
Liabilities:
Convertible notes		$ 8,488	$ 8,349
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	11,488			660
Total	55,020			24,825
Liabilities:
Deferred consideration (Note 10)	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ETFs [Member]
Assets:
Securities owned, at fair value	18,812			24,165
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Securities owned, at fair value	24,720
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets:
Securities owned, at fair value	0
Level 1 [Member] | Securrency - Series A convertible preferred stock | Fair Value, Measurements, Nonrecurring [Member]
Assets:
Investment owned, at fair value	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	0
Total	83,634			10,730
Liabilities:
Deferred consideration (Note 10)	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ETFs [Member]
Assets:
Securities owned, at fair value	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Securities owned, at fair value	81,525			8,613
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets:
Securities owned, at fair value	2,109			2,117
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Liabilities:
Convertible notes				170,191
Level 2 [Member] | Securrency - Series A convertible preferred stock | Fair Value, Measurements, Nonrecurring [Member]
Assets:
Investment owned, at fair value	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	0
Total	0
Liabilities:
Deferred consideration (Note 10)	228,062			$ 230,137
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ETFs [Member]
Assets:
Securities owned, at fair value	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Pass-through GSEs [Member]
Assets:
Securities owned, at fair value	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets:
Securities owned, at fair value	0
Level 3 [Member] | Securrency - Series A convertible preferred stock | Fair Value, Measurements, Nonrecurring [Member]
Assets:
Investment owned, at fair value	$ 8,488

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