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Regulatory Authorities - Additional Information (Detail) - USD ($)
Sep. 30, 2021
Jun. 30, 2021
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 130,195,000  
Regulatory capital in excess of minimum requirement $ 124,982,000  
Aggregate indebtedness to net capital ratio 0.60  
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 $ 173,662,000  
Regulatory capital in excess of minimum requirement 150,860,000  
CFLF [Member]    
Regulatory Requirements [Line Items]    
Regulatory capital 146,256,000  
Regulatory capital in excess of minimum requirement 81,613,000  
Combined European Regulated Group [Member]    
Regulatory Requirements [Line Items]    
Regulatory capital   $ 170,270,000
Regulatory capital in excess of minimum requirement   $ 88,137,000
Other U.S. and Non-U.S. Subsidiaries [Member]    
Regulatory Requirements [Line Items]    
Regulatory capital 217,599,000  
Regulatory capital in excess of minimum requirement $ 188,283,000