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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reinsurance Disclosures [Abstract]
Direct premiums written									$ 1,190,875	$ 1,055,886	$ 954,617
Ceded premiums written									(363,201)	(318,826)	(298,523)
Net premiums written									827,674	737,060	656,094
Direct premiums earned									1,121,640	999,198	921,227
Ceded premiums earned									(353,258)	(310,405)	(288,811)
Premiums earned, net	$ 204,595	$ 188,938	$ 192,272	$ 182,577	$ 183,708	$ 174,517	$ 169,009	$ 161,559	768,382	688,793	632,416
Direct Losses and Loss Adjustment Expenses									1,325,323	779,122	303,036
Ceded Losses and Loss Adjustment Expenses									(910,868)	(428,694)	(1,807)
Net Losses and Loss Adjustment Expenses									$ 414,455	$ 350,428	$ 301,229

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