Reinsurance - Impact of the Reinsurance Contracts on Premiums Written and Earned (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024		Mar. 31, 2023
Premiums Written:
Direct	$ 211,895		$ 207,423
Assumed	43,091		(7,569)
Gross written	254,986		199,854
Ceded	(68,106)		(70,509)
Net premiums written	186,880		129,345
Premiums Earned:
Direct	189,675		172,905
Assumed	66,969		7,163
Gross earned	256,644	[1]	180,068	[2]
Ceded	(68,106)		(70,509)
Net premiums earned	$ 188,538		$ 109,559

[1] Gross premiums earned under HCPCI Insurance Operations consist of $149,271 from HCPCI and $6,111 from a reinsurance company.

[2] Gross premiums earned under HCPCI Insurance Operations consist of $92,456 from HCPCI and $4,535 from a reinsurance company.