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Reinsurance - Insurance Entities' Reinsurance Arrangements (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reinsurance Disclosures [Abstract]
Direct premiums written	$ 409,418	$ 342,872	$ 1,148,656	$ 990,066
Ceded premiums written	(3,062)	(4,781)	(497,263)	(422,414)
Net premiums written	406,356	338,091	651,393	567,652
Direct premiums earned	357,208	313,065	1,020,798	911,550
Ceded premiums earned	(123,017)	(106,466)	(339,408)	(284,867)
Premiums earned, net	234,191	206,599	681,390	626,683
Direct losses and loss adjustment expenses	347,207	334,440	682,896	663,768
Ceded losses and loss adjustment expenses	(108,730)	(201,869)	(158,026)	(304,807)
Net Losses and Loss Adjustment Expenses	$ 238,477	$ 132,571	$ 524,870	$ 358,961

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