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Liability for Unpaid Losses and Loss Adjustment Expenses - Summary of Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) $ in Thousands	Dec. 31, 2019 USD ($) Claim	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Claims Development [Line Items]
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance	$ 1,734,939
Accident Year 2015 [Member]
Claims Development [Line Items]
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance	225,964	$ 213,860	$ 194,600	$ 187,431	$ 170,381
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims	$ 763
Cumulative Number of Reported Claims | Claim	26,785
Accident Year 2016 [Member]
Claims Development [Line Items]
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance	$ 351,487	324,577	286,252	$ 269,814
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims	$ (719)
Cumulative Number of Reported Claims | Claim	40,504
Accident Year 2017 [Member]
Claims Development [Line Items]
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance	$ 375,123	334,734	$ 303,944
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims	$ (5,547)
Cumulative Number of Reported Claims | Claim	127,129
Accident Year 2018 [Member]
Claims Development [Line Items]
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance	$ 335,946	$ 334,368
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims	$ (2,546)
Cumulative Number of Reported Claims | Claim	53,899
Accident Year 2019 [Member]
Claims Development [Line Items]
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance	$ 446,419
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims	$ (67,638)
Cumulative Number of Reported Claims | Claim	46,079

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Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 4E
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Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Cumulative number of reported claims for short-duration insurance contracts.

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