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Regulatory Authorities - Additional Information (Detail) - USD ($)
Jun. 30, 2022
Mar. 31, 2022
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 63,059,000  
Regulatory capital in excess of minimum requirement $ 58,868,000  
Aggregate indebtedness to net capital ratio 1.00  
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 $ 143,683,000  
Regulatory capital in excess of minimum requirement 86,005,000  
CFLF [Member]    
Regulatory Requirements [Line Items]    
Regulatory capital   $ 131,148,000
Regulatory capital in excess of minimum requirement   62,075,000
Combined European Regulated Group [Member]    
Regulatory Requirements [Line Items]    
Regulatory capital   149,268,000
Regulatory capital in excess of minimum requirement   $ 69,552,000
Other U.S. and Non-U.S. Subsidiaries [Member]    
Regulatory Requirements [Line Items]    
Regulatory capital 190,739,000  
Regulatory capital in excess of minimum requirement $ 163,830,000