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Reinsurance - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Reinsurance
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Reinsurance
Jun. 30, 2023
USD ($)
Dec. 31, 2023
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 $ 303,162   $ 303,162   $ 350,294
Ceded losses recognized as a reduction in losses and loss adjustment expenses 2,672 $ 1,109 2,672 $ 3,860  
Decrease in credit loss expense 3 101 52 102  
Allowances for credit losses related to the reinsurance recoverable balance 66   66   118
Reduction in premiums ceded 6,993 6,993 13,986 13,986  
Benefits receivable related to retrospective reinsurance contracts 58,275   58,275   44,289
Funds withheld for assumed business 14,353   14,353   30,087
Assumed premiums written 22,613 0 65,704 (7,569)  
Reinsurance payable on paid losses and loss adjustment expenses 0   0   3,145
Citizens [Member]          
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]          
Assumed premiums written 22,613 0 65,704 0  
United [Member]          
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]          
Funds withheld for assumed business 14,353   14,353    
Net amount due to entity 2,020   2,020    
Northeast Region [Member] | United [Member]          
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]          
Net amount payable 582   582   582
Southeast Region [Member] | United [Member]          
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]          
Net amount payable 1,438   1,438   4,203
Assumed premiums written payable 1,712   1,712   1,712
Assumed premiums written   $ 0   $ 7,569  
Reinsurance payable on paid losses and loss adjustment expenses         2,765
Ceding commission receivable $ 274   $ 274   $ 274
Participating Reinsurers [Member]          
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]          
Number of reinsurers | Reinsurance 44   44   33
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]          
Percentage of reinsurance recoverable major reinsurers     71.40%