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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
netLossRatioPoint
Dec. 31, 2021
USD ($)
netLossRatioPoint
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Claims Development [Line Items]          
Unpaid losses and loss adjustment expenses   $ 692,574,000 $ 23,751,000 $ 54,705,000  
Unpaid losses and loss adjustment expenses   1,038,790,000 346,216,000 322,465,000 $ 267,760,000
Policyholder benefits and claims incurred, gross   1,972,541,000 1,189,444,000 1,080,058,000  
Incurred (recovered) related to current year   913,419,000 724,755,000 700,473,000  
Incurred (recovered) related to prior year   24,980,000 54,450,000 58,337,000  
Policyholder benefits and claims incurred, ceded   $ 1,034,142,000 $ 410,239,000 $ 321,248,000  
Insurance claim maximum settlement time   1 year      
Initial case reserve for claims   $ 2,500      
LAE case reserves   $ 0      
Adverse Prior Years' Reserve Development          
Claims Development [Line Items]          
Net loss ratio | netLossRatioPoint   2.2 5.3    
Incurred (recovered) related to prior year   $ 25,000,000.0 $ 54,500,000    
Hurricane Ian          
Claims Development [Line Items]          
Incurred (recovered) related to current year $ 66,000,000 $ 111,000,000      
Net loss ratio | netLossRatioPoint   9.9 2.7    
Incurred (recovered) related to prior year   $ 28,000,000.0      
Subrogation          
Claims Development [Line Items]          
Subrogation recoveries value   $ 134,400,000 $ 118,600,000