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Reserve for Known and Incurred but Not Reported Claims - Schedule of Supplementary Information about Average Historical Claims (Detail)	Dec. 31, 2021
Shortduration Insurance Contracts Liability For Unpaid Claims And Allocated Claim Adjustment Expense Net [Abstract]
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 1	83.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 2	13.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 3	1.60%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 4	0.80%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 5	0.50%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 6	0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 7	0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 8	0.10%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 9	0.00%
Average annual percentage payout of incurred claims by age, net of reinsurance, Year 10	0.00%

X

- Definition

Percentage of average annual payout, after reinsurance, in the eighth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 4G
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Percentage of average annual payout, after reinsurance, in the fifth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the fourth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the ninth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the first year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the seventh year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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-SubTopic 40
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Percentage of average annual payout, after reinsurance, in the sixth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

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Percentage of average annual payout, after reinsurance, in the tenth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the third year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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Percentage of average annual payout, after reinsurance, in the second year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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