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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Claims Development [Line Items]
Unpaid losses and loss adjustment expenses	$ 23,751,000	$ 54,705,000	$ (205,069,000)
Unpaid losses and loss adjustment expenses	346,216,000	322,465,000	267,760,000	$ 472,829,000
Policyholder benefits and claims incurred, gross	1,189,444,000	1,080,058,000	1,084,604,000
Incurred (recovered) related to prior years	54,437,000	58,337,000	88,068,000
Policyholder benefits and claims incurred, ceded	$ 410,239,000	321,248,000	$ 481,198,000
Term of notice	3 years
Insurance claim maximum settlement time	1 year
Initial case reserve for claims	$ 2,500
LAE case reserves	0
Adverse Prior Years' Reserve Development
Claims Development [Line Items]
Policyholder benefits and claims incurred, gross	464,700,000
Incurred (recovered) related to prior years	54,500,000
Accidents Excluding Hurricanes
Claims Development [Line Items]
Policyholder benefits and claims incurred, gross	44,300,000
Incurred (recovered) related to prior years	44,900,000
Hurricane
Claims Development [Line Items]
Policyholder benefits and claims incurred, gross	420,400,000
Incurred (recovered) related to prior years	9,600,000
Policyholder benefits and claims incurred, ceded	410,800,000
Hurricane Irma
Claims Development [Line Items]
Incurred (recovered) related to prior years	20,600,000
Hurricane Sally and Hurricane Michael
Claims Development [Line Items]
Incurred (recovered) related to prior years	(11,000,000)
Subrogation
Claims Development [Line Items]
Subrogation recoveries value	$ 118,600,000	$ 71,200,000

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Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

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The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

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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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Initial case reserve claim liability.

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Insurance claim maximum settlement period.

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Liability for unpaid losses and loss adjustment expenses case reserve.

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Policyholder Benefits and Claims Incurred, Covenant Term Of Notice

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Estimated subrogation is generally deducted from the liability for unpaid claims.

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