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Impairments - Summary of Impairments Recognized (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Impairments |  | $ 0 | $ 16,156 | $ 22,752
Fixed assets [Member] | New York Office [Member] |  |  |  |
Impairments |  | 0 | 6,576 |
Lease Termination [Member] | New York Office [Member] |  |  |  |
Impairments |  | 0 | 9,277 |
Lease Termination [Member] | London Office [Member] |  |  |  |
Impairments | $ 303 | 0 | $ 303 |
AdvisorEngine – Financial interests [Member] | Financial Interests [Member] |  |  |  |
Impairments |  | 0 |  | 19,672
Thesys – Series Y Preferred [Member] |  |  |  |
Impairments |  | $ 0 |  | $ 3,080

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- 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 https://asc.fasb.org/extlink&oid=126954810&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 https://asc.fasb.org/extlink&oid=126905981&loc=d3e2420-110228 + Details
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