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Share-Based Compensation Plans - Additional Information (Detail) - USD ($)		12 Months Ended				204 Months Ended	240 Months Ended
	Oct. 21, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded			200,000	140,000	300,000
Options forfeited			46,666	446,667	100,000
Average strike price per share			$ 20.77	$ 28.70	$ 52.79
Compensation expense, options			$ 300,000	$ (1,100,000)	$ 1,600,000
Proceed from exercise of options			$ 0	$ 0	$ 0
Fair value of share			$ 23.31				$ 23.31
Weighted average fair value of options granted			$ 2.98	$ 6.95	$ 1.92
Number of Penn-Patriot book value appreciation rights granted			0		0		0
BVAR Compensation expense				$ 2,300,000	$ 0
BVAR Accrued compensation expense			$ 0	$ 2,300,000			$ 0
Number of Penn-Patriot book value rights granted			179,096	131,438
Number of Penn-Patriot book value rights cliff vesting			69,034	97,432
Penn-Patriot book value rights cliff vesting period			3 years	3 years
Penn-Patriot book value rights compensation expense			$ 800,000	$ 100,000	$ 0
Penn-Patriot book value rights accrued compensation expense			$ 700,000	$ 100,000			$ 700,000
Share-based Compensation Award, Tranche 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Penn-Patriot book value appreciation rights granted				2,500,000
Aggregate Initial Notional Value				5.00%
Penn-Patriot book value vesting, number			34,463	34,006
Penn-Patriot book value vesting rights, percentage				50.00%
Penn-Patriot book value vesting date			Dec. 31, 2024	Oct. 26, 2022
Share-based Compensation Award, Tranche 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting date			Apr. 18, 2025
Number of Penn-Patriot book value appreciation rights granted				400,000
Aggregate Initial Notional Value				0.80%
Penn-Patriot book value vesting, number			20,855
Penn-Patriot book value vesting rights, percentage			50.00%	50.00%
Penn-Patriots Affiliates reduction of Insured Value of specified book of premium percentage				95.00%
Penn-Patriots Affiliates reduction of Insured Value of specified book vesting date				Oct. 26, 2023
Share-based Compensation Award, Tranche 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting date			Apr. 18, 2027
Penn-Patriot book value vesting rights, percentage			50.00%
Share-based Compensation Award, Tranche 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, vested and expected to vest			54,745				54,745
Vesting date			Jan. 01, 2023
Penn-Patriot book value vesting rights, percentage			16.50%
Share-based Payment Arrangement, Tranche 5
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting date			Jan. 01, 2024
Penn-Patriot book value vesting rights, percentage			16.50%
Share-based Compensation Award, Tranche 6
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting date			Jan. 01, 2025
Penn-Patriot book value vesting rights, percentage			17.00%
Share-based Compensation Award, Tranche 7
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting date			Mar. 15, 2026
Penn-Patriot book value vesting rights, percentage			50.00%
Share-based Compensation Award, Tranche 8
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting date			Mar. 15, 2026
Penn-Patriot book value vesting rights, percentage			100.00%
Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded	200,000
Exercisable period	7 years
Chief Executive Officer \| Share-based Compensation Award, Tranche 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date	25.00%
Vesting date	Nov. 01, 2022
Chief Executive Officer \| Share-based Compensation Award, Tranche 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date	25.00%
Vesting date	Feb. 01, 2023
Chief Executive Officer \| Share-based Compensation Award, Tranche 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date	25.00%
Vesting date	May 01, 2023
Chief Executive Officer \| Share-based Compensation Award, Tranche 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date	25.00%
Vesting date	Aug. 01, 2023
Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense, options		$ 600,000
Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded			0	140,000	0
Options forfeited			46,666	146,667	100,000
Average strike price per share				$ 28.70
Performance Based Stock Options \| Strike Price of $28.70
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options forfeited			46,666	46,667
Time Based Option Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options awarded			200,000	0	300,000
Options forfeited			0	300,000	0
Average strike price per share			$ 20.77		$ 52.79
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense, restricted stock			$ 2,000,000.0	$ 2,500,000	$ 3,200,000
Unrecognized compensation expense for non-vested restricted stock			$ 0				$ 0
Restricted Stock Awards			97,260	83,199	108,521	1,810,656	2,099,636
Weighted average fair value per share			$ 25.08	$ 27.24	$ 24.86
Shares vested			100,975	101,048	128,623
Restricted Stock \| Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards			0	0	0	1,171,576	1,171,576
Restricted Stock \| Non Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards			97,260	83,199	108,521
Weighted average fair value per share			$ 25.08	$ 27.24	$ 24.86
Shares deferred for vesting			32,540	20,392	30,172
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense, restricted stock			$ 1,500,000	$ 900,000	$ 3,200,000
Unrecognized compensation expense for non-vested restricted stock			$ 700,000				$ 700,000
Weighted average life of non-vested restricted stock unit			1 year 2 months 12 days
Restricted Stock Awards			0	0	202,905	175,498	378,403
Weighted average fair value per share			$ 0	$ 0	$ 29.02
Shares vested			47,633	44,245	41,667
Restricted Stock Units \| Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards			0	0	161,238	175,498	336,736
Weighted average fair value per share					$ 30.32
Shares vested					3,375
Vesting year					3 years
Restricted Stock Units \| Key Employees \| Vesting Schedule One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, vested and expected to vest					66,957
Restricted Stock Units \| Key Employees \| Share-based Compensation Award, Tranche 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date					10.00%
Vesting date					Jun. 18, 2021
Restricted Stock Units \| Key Employees \| Share-based Compensation Award, Tranche 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date					20.00%
Vesting date					Jun. 18, 2022
Restricted Stock Units \| Key Employees \| Share-based Compensation Award, Tranche 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date					30.00%
Vesting date					Jun. 18, 2023
Restricted Stock Units \| Key Employees \| Vesting Schedule Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, vested and expected to vest					90,906
Percentage of shares vested on each anniversary of the grant date					100.00%
Vesting date					Mar. 15, 2023
Percentage of stock award subject to vesting					50.00%
Restricted Stock Units \| Key Employees \| Share-based Compensation Award, Tranche 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date					40.00%
Vesting date					Jun. 18, 2024
Restricted Stock Units \| Key Employees \| Share-based Payment Arrangement, Tranche 5
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date					16.50%
Vesting date					Jan. 01, 2021
Restricted Stock Units \| Key Employees \| Share-based Compensation Award, Tranche 6
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date					16.50%
Vesting date					Jan. 01, 2022
Restricted Stock Units \| Key Employees \| Share-based Compensation Award, Tranche 7
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested on each anniversary of the grant date					17.00%
Vesting date					Jan. 01, 2023
Restricted Stock Units \| Non Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards					41,667
Weighted average fair value per share					$ 24.00