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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reinsurance Disclosures [Abstract]
Direct premiums written									$ 1,671,252	$ 1,517,479	$ 1,292,721
Ceded premiums written									(586,425)	(512,576)	(423,076)
Net premiums written									1,084,827	1,004,903	869,645
Direct premiums earned									1,596,618	1,395,623	1,233,121
Ceded premiums earned									(561,155)	(472,060)	(390,619)
Premiums earned, net	$ 271,332	$ 264,654	$ 256,172	$ 243,305	$ 242,173	$ 234,191	$ 226,370	$ 220,829	1,035,463	923,563	842,502
Direct Losses and Loss Adjustment Expenses									1,189,444	1,080,058	1,084,604
Ceded Losses and Loss Adjustment Expenses									(410,239)	(321,248)	(481,198)
Net Losses and Loss Adjustment Expenses									$ 779,205	$ 758,810	$ 603,406

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