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Supplementary Information about Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Claims Development [Line Items]
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	$ 735,088
Commercial Specialty | Property Insurance
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	198,244
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	47,500
Commercial Specialty | Property Insurance | Accident Year 2020
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	73,640	$ 69,944	$ 47,486
Commercial Specialty | Property Insurance | Accident Year 2021
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	74,860	50,846
Commercial Specialty | Property Insurance | Accident Year 2022
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	49,744
Commercial Specialty | Property Insurance | All outstanding liabilities before 2020, net of reinsurance
Claims Development [Line Items]
All outstanding liabilities, net of reinsurance	3,025
Commercial Specialty | Casualty Insurance
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	412,063
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	380,628
Commercial Specialty | Casualty Insurance | Accident Year 2013
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	53,525	53,471	53,194	$ 52,468	$ 51,167	$ 46,475	$ 38,641	$ 29,705	$ 17,969	$ 6,439
Commercial Specialty | Casualty Insurance | Accident Year 2014
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	46,578	46,263	45,831	43,505	40,293	34,504	26,526	15,924	4,011
Commercial Specialty | Casualty Insurance | Accident Year 2015
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	50,169	48,524	46,272	43,116	36,357	25,559	14,865	3,355
Commercial Specialty | Casualty Insurance | Accident Year 2016
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	47,352	44,130	40,639	34,973	22,064	14,047	4,148
Commercial Specialty | Casualty Insurance | Accident Year 2017
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	46,169	39,926	33,511	23,326	12,879	4,996
Commercial Specialty | Casualty Insurance | Accident Year 2018
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	42,884	34,745	22,194	13,869	4,303
Commercial Specialty | Casualty Insurance | Accident Year 2019
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	48,285	30,439	14,017	5,222
Commercial Specialty | Casualty Insurance | Accident Year 2020
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	40,665	19,623	5,510
Commercial Specialty | Casualty Insurance | Accident Year 2021
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	24,414	7,238
Commercial Specialty | Casualty Insurance | Accident Year 2022
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	12,022
Commercial Specialty | Casualty Insurance | All outstanding liabilities before 2013, net of reinsurance
Claims Development [Line Items]
All outstanding liabilities, net of reinsurance	44,506
Reinsurance Operations | Casualty Insurance
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	12,408
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	179,608
Reinsurance Operations | Casualty Insurance | Accident Year 2012
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance			0	0	0
Reinsurance Operations | Casualty Insurance | Accident Year 2013
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	0	0				0	0	0	0	$ 0
Reinsurance Operations | Casualty Insurance | Accident Year 2014
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	0	0	0	0	0	0	0	0	$ 0
Reinsurance Operations | Casualty Insurance | Accident Year 2015
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	0	0	0	0	0	0	0	0
Reinsurance Operations | Casualty Insurance | Accident Year 2016
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	0	0	0	0	0	0	0
Reinsurance Operations | Casualty Insurance | Accident Year 2017
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	2	2	2	2	2	0
Reinsurance Operations | Casualty Insurance | Accident Year 2018
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	6	6	0	0	0
Reinsurance Operations | Casualty Insurance | Accident Year 2019
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,925	1,014	801	27
Reinsurance Operations | Casualty Insurance | Accident Year 2020
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	4,503	2,174	48
Reinsurance Operations | Casualty Insurance | Accident Year 2021
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	3,986	1,593
Reinsurance Operations | Casualty Insurance | Accident Year 2022
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,986
Reinsurance Operations | Casualty Insurance | All outstanding liabilities before 2013, net of reinsurance
Claims Development [Line Items]
All outstanding liabilities, net of reinsurance	0
Exited Lines Segment | Property Insurance
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	426,907
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	89,018
Exited Lines Segment | Property Insurance | Accident Year 2019
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	145,406	140,463	128,338	99,554
Exited Lines Segment | Property Insurance | Accident Year 2020
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	148,159	143,332	121,430
Exited Lines Segment | Property Insurance | Accident Year 2021
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	98,809	82,528
Exited Lines Segment | Property Insurance | Accident Year 2022
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	34,533
Exited Lines Segment | Property Insurance | All outstanding liabilities before 2019, net of reinsurance
Claims Development [Line Items]
All outstanding liabilities, net of reinsurance	44,812
Exited Lines Segment | Casualty Insurance
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	81,501
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance	38,334
Exited Lines Segment | Casualty Insurance | Accident Year 2015
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	18,806	18,785	18,584	17,959	15,575	12,515	8,605	$ 3,527
Exited Lines Segment | Casualty Insurance | Accident Year 2016
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	14,783	14,347	12,478	11,824	9,745	6,865	$ 3,494
Exited Lines Segment | Casualty Insurance | Accident Year 2017
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	12,413	12,021	11,585	8,406	4,635	$ 2,051
Exited Lines Segment | Casualty Insurance | Accident Year 2018
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	14,169	12,593	8,840	4,522	$ 1,334
Exited Lines Segment | Casualty Insurance | Accident Year 2019
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	9,820	7,900	5,011	$ 1,975
Exited Lines Segment | Casualty Insurance | Accident Year 2020
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	7,531	4,949	$ 1,583
Exited Lines Segment | Casualty Insurance | Accident Year 2021
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	3,125	$ 1,628
Exited Lines Segment | Casualty Insurance | Accident Year 2022
Claims Development [Line Items]
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	854
Exited Lines Segment | Casualty Insurance | All outstanding liabilities before 2015, net of reinsurance
Claims Development [Line Items]
All outstanding liabilities, net of reinsurance	$ 4,683

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Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.

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