v3.25.1
Reinsurance - Additional Information (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2025
USD ($)
Reinsurance
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Reinsurance
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Percentage of ceding commission on ceded premiums written 30.00%    
Profit commission on net profit 10.00%    
Reinsurance recoverable $ 527,769   $ 558,441
Ceded losses recognized as a reduction in losses and loss adjustment expenses 6 $ 0  
Decrease in credit loss expense 35 49  
Allowances for credit losses related to the reinsurance recoverable balance 151   186
Reduction in premiums ceded   6,993  
Other Assets [1] 9,642   9,818
Benefits receivable related to retrospective reinsurance contracts 0   0
Funds withheld for assumed business 8,451   11,690
Assumed premiums written (20,790) (43,091)  
Reinsurance payable on paid losses and loss adjustment expenses 0   2,496
United [Member]      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Funds withheld for assumed business 8,451   11,690
Funds Held under Reinsurance Agreements, Liability 8,451    
Net amount due to entity 2,269    
Citizens [Member]      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Assumed premiums written (20,790) $ (43,091)  
Northeast Region [Member] | United [Member]      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Net amount payable $ 831   831
Southeast Region [Member] | United [Member]      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Net amount payable     1,438
Assumed Premiums Written Payable     1,712
Ceding commission receivable     $ 274
Participating Reinsurers [Member]      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Number of reinsurers | Reinsurance 44   44
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments [Member] | Reinsurer Concentration Risk [Member] | Reinsurance [Member]      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Concentration risk, percentage 74.60%    
[1] See Note 14 for details of balances associated with consolidated variable interest entities.