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Loss and Loss Adjustment Expenses - Development Tables of Incurred and Paid Losses and Allocated Loss Adjustment Expenses Net of Reinsurance (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Claim
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,995,004                  
Total IBNR Plus Expected Development on Reported Claims 29,246                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,559,528                  
All outstanding liabilities before 2012, net of reinsurance 103,092                  
Liabilities for loss and loss adjustment expenses, net of reinsurance 538,567                  
Accident Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 203,499 $ 205,556 $ 207,086 $ 207,929 $ 211,758 $ 220,965 $ 235,471 $ 252,514 $ 262,573 $ 262,573
Total IBNR Plus Expected Development on Reported Claims $ 4,359                  
Cumulative Number of Claims Reported | Claim 5,517                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 189,578 190,588 189,339 188,145 185,657 182,053 170,461 151,818 121,599 $ 54,141
Claim Frequency 14.25%                  
Accident Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 197,359 198,566 201,604 202,820 209,214 218,005 241,406 250,491 250,491  
Total IBNR Plus Expected Development on Reported Claims $ 4,666                  
Cumulative Number of Claims Reported | Claim 5,395                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 179,521 178,572 174,134 172,133 166,887 156,860 143,016 115,713 $ 52,238  
Claim Frequency 14.23%                  
Accident Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 203,443 206,293 208,360 211,964 220,096 234,587 244,098 244,094    
Total IBNR Plus Expected Development on Reported Claims $ 5,297                  
Cumulative Number of Claims Reported | Claim 5,214                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 186,798 185,690 183,696 175,733 166,448 151,427 122,552 $ 56,951    
Claim Frequency 14.69%                  
Accident Year 2018 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 203,456 205,001 208,517 217,369 235,641 250,487 250,487      
Total IBNR Plus Expected Development on Reported Claims $ 3,865                  
Cumulative Number of Claims Reported | Claim 5,478                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 187,196 184,797 181,081 172,423 152,328 126,057 $ 62,061      
Claim Frequency 15.23%                  
Accident Year 2019 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 203,072 206,109 214,123 227,246 241,344 241,344        
Total IBNR Plus Expected Development on Reported Claims $ 5,628                  
Cumulative Number of Claims Reported | Claim 5,223                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 180,586 176,488 168,448 154,391 120,512 $ 58,884        
Claim Frequency 15.28%                  
Accident Year 2020 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 200,698 207,047 214,500 220,710 220,710          
Total IBNR Plus Expected Development on Reported Claims $ 12,923                  
Cumulative Number of Claims Reported | Claim 4,391                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 162,703 153,974 137,411 109,882 $ 50,113          
Claim Frequency 13.95%                  
Accident Year 2021 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 211,548 215,232 222,715 222,715            
Total IBNR Plus Expected Development on Reported Claims $ 4,359                  
Cumulative Number of Claims Reported | Claim 4,314                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 174,454 159,864 130,288 $ 52,292            
Claim Frequency 15.06%                  
Accident Year 2022 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 190,117 192,907 192,907              
Total IBNR Plus Expected Development on Reported Claims $ (3,907)                  
Cumulative Number of Claims Reported | Claim 4,088                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 138,000 110,494 $ 50,954              
Claim Frequency 14.48%                  
Accident Year 2023 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 189,659 189,659                
Total IBNR Plus Expected Development on Reported Claims $ 3,422                  
Cumulative Number of Claims Reported | Claim 3,924                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 107,823 $ 47,207                
Claim Frequency 13.83%                  
Accident Year 2024 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 192,153                  
Total IBNR Plus Expected Development on Reported Claims $ (11,366)                  
Cumulative Number of Claims Reported | Claim 3,577                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 52,869                  
Claim Frequency 12.39%