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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reinsurance Disclosures [Abstract]
Direct premiums written									$ 1,517,479	$ 1,292,721	$ 1,190,875
Ceded premiums written									(512,576)	(423,076)	(363,201)
Net premiums written									1,004,903	869,645	827,674
Direct premiums earned									1,395,623	1,233,121	1,121,640
Ceded premiums earned									(472,060)	(390,619)	(353,258)
Premiums earned, net	$ 242,173	$ 234,191	$ 226,370	$ 220,829	$ 215,819	$ 206,599	$ 210,357	$ 209,727	923,563	842,502	768,382
Direct Losses and Loss Adjustment Expenses									1,080,058	1,084,604	1,325,323
Ceded Losses and Loss Adjustment Expenses									(321,248)	(481,198)	(910,868)
Net Losses and Loss Adjustment Expenses									$ 758,810	$ 603,406	$ 414,455

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