v3.25.1
Deferred Policy Acquisition Costs, Net of Ceding Commissions - Schedule of deferred policy acquisition costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
DPAC, excluding unearned ceding commission [Member]    
Deferred Policy Acquisition Cost [Line Items]    
DPAC, beginning of period $ 38,803 $ 43,080
Producer commissions 18,086 15,839
Premium taxes 2,664 1,513
Other acquisition costs 2,490 1,936
Total policy acquisition costs 23,240 19,288
Amortization (18,593) (22,449)
DPAC, end of period 43,450 39,919
Unearned ceding commission [Member]    
Deferred Policy Acquisition Cost [Line Items]    
DPAC, beginning of period (70,734) (48,217)
Ceding commissions (38,218) (24,872)
Total policy acquisition costs (38,218) (24,872)
Amortization 38,666 25,494
DPAC, end of period (70,286) (47,595)
Total [Member]    
Deferred Policy Acquisition Cost [Line Items]    
DPAC, beginning of period (31,931) (5,137)
Producer commissions 18,086 15,839
Premium taxes 2,664 1,513
Other acquisition costs 2,490 1,936
Ceding commissions (38,218) (24,872)
Total policy acquisition costs (14,978) (5,585)
Amortization 20,073 3,044
DPAC, end of period $ (26,836) $ (7,678)