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Reinsurance - Reinsurance Arrangements (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
Reinsurance Disclosures [Abstract]
Direct premiums written									$ 1,845,786	$ 1,671,252	$ 1,517,479
Ceded premiums written									(672,508)	(586,425)	(512,576)
Net premiums written									1,173,278	1,084,827	1,004,903
Direct premiums earned									1,759,701	1,596,618	1,395,623
Ceded premiums earned									(631,075)	(561,155)	(472,060)
Premiums earned, net	$ 291,870	$ 290,631	$ 277,061	$ 269,064	$ 271,332	$ 264,654	$ 256,172	$ 243,305	1,128,626	1,035,463	923,563
Direct Losses and Loss Adjustment Expenses									1,972,541	1,189,444	1,080,058
Ceded Losses and Loss Adjustment Expenses									(1,034,142)	(410,239)	(321,248)
Net Losses and Loss Adjustment Expenses									$ 938,399	$ 779,205	$ 758,810

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