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Schedule VI - Supplemental Information Concerning Consolidated Property and Casualty Insurance Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]                        
Reserves for Unpaid Losses and LAE $ 1,038,790       $ 346,216       $ 1,038,790 $ 346,216 $ 322,465 $ 267,760
Incurred Loss and LAE Current Year                 913,419 724,755 700,473  
Incurred Loss and LAE Prior Years                 24,980 54,450 58,337  
Paid Losses and LAE                 928,645 751,792 700,406  
Net investment income 10,448 $ 6,074 $ 5,221 $ 4,042 3,894 $ 2,797 $ 2,858 $ 2,986 25,785 12,535 20,393  
Deferred Policy Acquisition Cost (“DPAC”) 103,654       108,822       103,654 108,822 110,614 $ 91,882
Amortization of DPAC, Net                 (217,235) (224,121) (199,154)  
Net Premiums Written                 1,173,278 1,084,827 1,004,903  
Net Premiums Earned 291,870 $ 290,631 $ 277,061 $ 269,064 271,332 $ 264,654 $ 256,172 $ 243,305 1,128,626 1,035,463 923,563  
Unearned premiums $ 943,854       $ 857,769       $ 943,854 $ 857,769 $ 783,135