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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Direct losses and loss adjustment expenses	$ 162,446	$ 213,586	$ 335,689	$ 329,328
Ceded losses and loss adjustment expenses	11,101	100,290	49,296	102,938
Incurred (recovered) related to prior years	478	$ 670	4,819	$ 485
Hurricane
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Direct losses and loss adjustment expenses	11,600		54,100
Ceded losses and loss adjustment expenses	11,100		49,300
Incurred (recovered) related to prior years	$ 500		$ 4,800

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Amount, before effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred.

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Amount of reduction of provision for policy benefits and costs incurred for policies ceded.

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Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

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-Publisher FASB
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