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Reinsurance - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) Reinsurer	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Reinsurer	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) Reinsurer
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage of ceding commission on ceded premiums written				30.00%
Reinsurance recoverable		$ 95,274		$ 95,274		$ 132,678
Number of reinsurers | Reinsurer		38		38		31
Ceded losses recognized as a reduction in losses and loss adjustment expenses		$ 1,871	$ 113,888	$ 2,220	$ 113,888
Decrease in credit loss expense		14		363
Allowances for credit losses related to the reinsurance recoverable balance		90		90		$ 0
Reduction in premiums ceded		4,680		10,440
Net reduction in premiums ceded			$ 2,520		$ 4,258
Other assets		20,376		20,376		17,080
Reinsurance premium refund received	$ 13,680
Reinsurance [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Other assets		$ 6,240		$ 6,240		$ 9,480
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk [Member] | Florida Hurricane Catastrophe Fund [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage of reinsurance recoverable major reinsurers				58.60%

X

- Definition

Amount, before valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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Represents a net reduction recognized in ceded premiums related to reinsurance contracts with retrospective provisions.

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Number of reinsurers participating in the company's reinsurance program.

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Percentage of ceding commission on ceded premiums written.

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Represents a reduction recognized in ceded premiums related to reinsurance contracts with retrospective provisions.

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Reinsurance premium refund received.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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

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Amount of expense (reversal of expense) for expected credit loss on reinsurance recoverable.

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Amount of allowance for credit loss on reinsurance recoverable.

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