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Liability for Unpaid Losses and Loss Adjustment Expenses - Supplementary Information About Average Historical Claims Duration (Detail)	Dec. 31, 2019
Insurance [Abstract]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year one	61.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year two	19.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year three	9.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year four	4.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year five	2.50%

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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.

+ 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 fourth 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 first 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
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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.

+ 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 second year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

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-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 4G
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