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Regulatory Authorities - Additional Information (Detail) - USD ($) | Mar. 31, 2023 | Dec. 31, 2022
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LFNY [Member] |  |
Regulatory Requirements [Line Items] |  |
Specified fixed percentage, minimum required capital | 6.67% |
Minimum net capital requirement as defined under exchange act | $ 5,000 |
Regulatory capital | 48,294,000 |
Regulatory capital in excess of minimum requirement | $ 43,030,000 |
Aggregate indebtedness to net capital ratio | 1.63 |
LFNY [Member] | Maximum [Member] |  |
Regulatory Requirements [Line Items] |  |
Aggregate indebtedness to net capital ratio | 15 |
U.K. Subsidiaries [Member] |  |
Regulatory Requirements [Line Items] |  |
Regulatory capital | $ 181,434,000 |
Regulatory capital in excess of minimum requirement | 122,490,000 |
CFLF [Member] |  |
Regulatory Requirements [Line Items] |  |
Regulatory capital |  | $ 152,442,000
Regulatory capital in excess of minimum requirement |  | 74,403,000
Combined European Regulated Group [Member] |  |
Regulatory Requirements [Line Items] |  |
Regulatory capital |  | 176,343,000
Regulatory capital in excess of minimum requirement |  | $ 89,905,000
Other U.S. and Non-U.S. Subsidiaries [Member] |  |
Regulatory Requirements [Line Items] |  |
Regulatory capital | 150,254,000 |
Regulatory capital in excess of minimum requirement | $ 123,459,000 |

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- Definition Minimum amount of net capital required to be maintained by broker-dealer and its subsidiary, calculated under Aggregate Indebtedness Standard. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Amount of total risk-based capital exceeding minimum required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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