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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reinsurance Disclosures [Abstract]
Direct premiums written									$ 1,292,721	$ 1,190,875	$ 1,055,886
Ceded premiums written									(423,076)	(363,201)	(318,826)
Net premiums written									869,645	827,674	737,060
Direct premiums earned									1,233,121	1,121,640	999,198
Ceded premiums earned									(390,619)	(353,258)	(310,405)
Premiums earned, net	$ 215,819	$ 206,599	$ 210,357	$ 209,727	$ 204,595	$ 188,938	$ 192,272	$ 182,577	842,502	768,382	688,793
Direct Losses and Loss Adjustment Expenses									1,084,604	1,325,323	779,122
Ceded Losses and Loss Adjustment Expenses									(481,198)	(910,868)	(428,694)
Net Losses and Loss Adjustment Expenses									$ 603,406	$ 414,455	$ 350,428

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