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Impairments - Summary of Impairments Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Impairments	$ 15,853	$ 303	$ 3,080	$ 19,672	$ 16,156	$ 22,752	$ 30,710
Fixed assets [Member] | New York Office [Member]
Impairments					6,576
Lease Termination [Member] | New York Office [Member]
Impairments					9,277
Lease Termination [Member] | London Office [Member]
Impairments					303
AdvisorEngine – Financial interests [Member] | Financial Interests [Member]
Impairments					0	19,672	$ 30,138
Thesys – Series Y Preferred [Member]
Impairments					$ 0	$ 3,080

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228

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