REGULATORY AUTHORITIES - Additional Information (Details) $ in Thousands	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
LFNY
Regulatory Requirements [Line Items]
Minimum net capital requirement as defined under exchange act	$ 5
Aggregate indebtedness to net capital ratio	0.39
Regulatory capital	$ 88,440
Regulatory capital in excess of minimum requirement	86,169
U.K. Subsidiaries
Regulatory Requirements [Line Items]
Regulatory capital	102,581
Regulatory capital in excess of minimum requirement	29,520
CFLF
Regulatory Requirements [Line Items]
Regulatory capital		$ 146,131
Regulatory capital in excess of minimum requirement		61,858
Combined European Regulated Group
Regulatory Requirements [Line Items]
Regulatory capital		167,784
Regulatory capital in excess of minimum requirement		$ 73,786
Other U.S. and Non-U.S. Subsidiaries
Regulatory Requirements [Line Items]
Regulatory capital	105,581
Regulatory capital in excess of minimum requirement	$ 82,167