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Statutory Financial Information - Additional Information (Detail) - USD ($) $ in Thousands													1 Months Ended			12 Months Ended
	Dec. 30, 2022	Oct. 11, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Apr. 30, 2022	Jun. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statutory Accounting Practices [Line Items]
Dividends	$ 3,389	$ 3,616	$ 3,602	$ 3,597	$ 3,587	$ 3,583	$ 3,579	$ 3,570	$ 3,558	$ 3,552	$ 3,545	$ 3,539				$ 14,543	$ 14,578	$ 14,645
Merger date																Aug. 28, 2020
Penn Patriot Insurance Company
Statutory Accounting Practices [Line Items]
Maximum amount of dividends that could be paid in 2020 under applicable laws and regulations without regulatory approval													$ 36,700			$ 36,700
United National Insurance Companies
Statutory Accounting Practices [Line Items]
Maximum amount of dividends that could be paid in 2020 under applicable laws and regulations without regulatory approval													25,500			25,500
Dividends																4,500
American Reliable Insurance Company
Statutory Accounting Practices [Line Items]
Dividends													102,300	$ 22,500		124,800
Penn- America Insurance Companies
Statutory Accounting Practices [Line Items]
Maximum amount of dividends that could be paid in 2020 under applicable laws and regulations without regulatory approval													$ 11,000			11,000
Maximum amount of dividends payable under applicable laws and regulations without regulatory approval which would be distributed to wholly owned parent company																3,600
Dividends																$ 7,500
Global Indemnity Reinsurance
Statutory Accounting Practices [Line Items]
Dividends															$ 226,000
Maximum reduction in statutory capital allowed without regulatory approval																15.00%
Maximum reduction in statutory capital and surplus allowed without regulatory approval																25.00%

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Maximum percentage reduction to statutory capital allowed without approval from regulatory agency.

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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Amount of dividends that can be declared or paid without approval of regulatory agency.

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