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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Claims Development [Line Items]
Unpaid losses and loss adjustment expenses	$ 54,705,000	$ (205,069,000)	$ 224,404,000
Unpaid losses and loss adjustment expenses	322,465,000	267,760,000	472,829,000	$ 248,425,000
Policyholder benefits and claims incurred, gross	1,080,058,000	1,084,604,000	1,325,323,000
Policyholder benefits and claims incurred, net	758,810,000	603,406,000	414,455,000
Incurred (recovered) related to prior years	$ 58,337,000	88,068,000	99,522,000
Term of notice	3 years
Insurance claim maximum settlement time	1 year
Initial case reserve for claims	$ 2,500
LAE case reserves	0
Incurred (recovered) related to current year	700,473,000	515,338,000	$ 314,933,000
Subrogation [Member]
Claims Development [Line Items]
Subrogation recoveries value	71,000,000	$ 73,000,000
Hurricane Sally [Member]
Claims Development [Line Items]
Policyholder benefits and claims incurred, gross	133,400,000
Policyholder benefits and claims incurred, net	43,000,000.0
Other Weather Events [Member]
Claims Development [Line Items]
Policyholder benefits and claims incurred, gross	123,500,000
Policyholder benefits and claims incurred, net	119,000,000.0
Hurricanes and Accidents Excluding Hurricanes [Member]
Claims Development [Line Items]
Policyholder benefits and claims incurred, gross	284,300,000
Incurred (recovered) related to prior years	58,300,000
Accidents Excluding Hurricanes [Member]
Claims Development [Line Items]
Policyholder benefits and claims incurred, gross	42,100,000
Incurred (recovered) related to prior years	40,200,000
Hurricane [Member]
Claims Development [Line Items]
Policyholder benefits and claims incurred, gross	242,200,000
Incurred (recovered) related to prior years	$ 18,100,000

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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, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.

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Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs.

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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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