REGULATORY AUTHORITIES - Additional Information (Details)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
LFNY
Regulatory Requirements [Line Items]
Minimum net capital requirement as defined under exchange act	$ 5,000
Aggregate indebtedness to net capital ratio	0.49
Regulatory capital	$ 117,818,000
Regulatory capital in excess of minimum requirement	114,006,000
U.K. Subsidiaries
Regulatory Requirements [Line Items]
Regulatory capital	179,432,000
Regulatory capital in excess of minimum requirement	113,985,000
CFLF
Regulatory Requirements [Line Items]
Regulatory capital		$ 156,703,000
Regulatory capital in excess of minimum requirement		62,519,000
Combined European Regulated Group
Regulatory Requirements [Line Items]
Regulatory capital		181,665,000
Regulatory capital in excess of minimum requirement		$ 78,796,000
Other U.S. and Non-U.S. Subsidiaries
Regulatory Requirements [Line Items]
Regulatory capital	101,442,000
Regulatory capital in excess of minimum requirement	$ 78,564,000