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Reinsurance - 2022-2023 Reinsurance Program - Catastrophe Excess of Loss Reinsurance - Additional information - (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]    
Reinsurance payable $ 375,284 $ 191,728
NBIC [Member] | Minimum [Member]    
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]    
Reinsurance payable $ 3,500  
FHCF [Member]    
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]    
Reinsured risk percentage 90.00%  
2022-2023 Reinsurance Program member    
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]    
Reinsurance purchase limit $ 3,200,000  
Reinsurance payable 359,500  
First Catastrophe [Member] | 2022-2023 Reinsurance Program member | Maximum [Member]    
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]    
Retention under program to provide reinsurance coverage 780,000  
First Catastrophe [Member] | 2022-2023 Reinsurance Program member | Heritage P&C [Member] | Maximum [Member]    
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]    
Retention under program to provide reinsurance coverage 1,300,000  
First event retention for insurance company subsidiary 40,000  
First Catastrophe [Member] | 2022-2023 Reinsurance Program member | Zephyr [Member] | Maximum [Member]    
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]    
First event retention for insurance company subsidiary 40,000  
First Catastrophe [Member] | 2022-2023 Reinsurance Program member | Osprey and zephyr [member] | Maximum [Member]    
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]    
First event retention for insurance company subsidiary 30,000  
First Catastrophe [Member] | 2022-2023 Reinsurance Program member | Osprey and NBIC [member] | Maximum [Member]    
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]    
First event retention for insurance company subsidiary 30,000  
First Catastrophe [Member] | 2022-2023 Reinsurance Program member | Osprey [Member] | Maximum [Member]    
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]    
First event retention for insurance company subsidiary 35,000  
First Catastrophe [Member] | 2022-2023 Reinsurance Program member | NBIC [Member] | Maximum [Member]    
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]    
Retention under program to provide reinsurance coverage 1,200,000  
First event retention for insurance company subsidiary $ 30,000