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Impairments - Summary of Impairment of Long-Lived Assets Held and Used by Asset (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Impairments | $ 15,853 | $ 3,080 | $ 16,156 | $ 22,752
New York office [Member] | Fixed assets [Member] |  |  |  |
Impairments | 6,576 |  | 6,576 |
Lease Termination [Member] | New York office [Member] |  |  |  |
Impairments | $ 9,277 |  | 9,277 |
Lease Termination [Member] | London office [Member] |  |  |  |
Impairments |  |  | $ 303 |
AdvisorEngine – Financial interests [Member] | Financial Interests [Member] |  |  |  |
Impairments |  |  |  | 19,672
Thesys – Series Y Preferred [Member] |  |  |  |
Impairments |  | $ 3,080 |  | $ 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 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 + Details
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