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Reinsurance - 2026-2027 Reinsurance Program - Additional information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) Reinstatement	Jun. 30, 2025 USD ($)	Jun. 30, 2027 USD ($)	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Ceded premiums written	$ 415,937	$ 491,335	$ 457,375	$ 531,555
Number of reinstatements available \| Reinstatement			2
Unpaid losses and loss adjustment expenses	481,997	$ 713,183	$ 481,997	$ 713,183		$ 481,997	$ 579,477	$ 544,043	$ 848,928	$ 1,042,687
Reinsurance payable	501,033		501,033			501,033	232,801
Property Losses
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Retention under program to provide reinsurance coverage						2,500
Excess retention amount reinsured						1,000
Property Losses \| Forecast
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Retention under program to provide reinsurance coverage					$ 2,500
Excess retention amount reinsured					1,000
Causality Losses
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Retention under program to provide reinsurance coverage						1,000
Excess retention amount reinsured						$ 1,000
Excess retention percentage						47.50%
Causality Losses \| Forecast
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Retention under program to provide reinsurance coverage					$ 1,000
Excess retention percentage					50.00%
Insurance Claims
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Unpaid losses and loss adjustment expenses	2,000		2,000			$ 2,000
Facultative Reinsurance
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance payable	80,000		80,000			80,000
Facultative Reinsurance \| Hawaii
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Excess retention amount reinsured			10,000
Reinsurance payable	65,000		$ 65,000			65,000
NBIC
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsured risk percentage			100.00%
Number of reinstatements available \| Reinstatement			1
NBIC \| Insurance Claims \| Commercial Residential Losses
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Unpaid losses and loss adjustment expenses	1,500		$ 1,500			1,500
Reinsurance payable	1,500		1,500			1,500
NBIC \| 70% Reinsurance Contract
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Aggregate contract coverage limit			30,000
Excess retention amount reinsured			20,000
NBIC \| 30% Reinsurance Contract
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Aggregate contract coverage limit			25,000
Excess retention amount reinsured			25,000
NBIC \| 55% Reinsurance Contract
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Aggregate contract coverage limit			15,000
Excess retention amount reinsured			25,000
NBIC \| 45% Reinsurance Contract
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Aggregate contract coverage limit			20,000
Excess retention amount reinsured			20,000
NBIC \| 2025 - 2026 Net Quota Share Reinsurance
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Net lines quota share occurrence limit							$ 25,000
Percentage of renewed ceded net premium and losses							46.00%
NBIC \| 2024 - 2025 Net Quota Share Reinsurance
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Net lines quota share occurrence limit							$ 20,000
NBIC \| 2026 - 2027 Net Quota Share Reinsurance
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Net lines quota share occurrence limit							$ 30,000
Percentage of renewed ceded net premium and losses							40.00%
California HO E&S \| Facultative Reinsurance
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Excess retention amount reinsured			3,500
Zephyr \| NBIC \| Facultative Reinsurance \| Property Losses
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance payable	3,500		$ 3,500			3,500
FHCF
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsured risk percentage			90.00%
2026 - 2027 Reinsurance Program
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance purchase limit	3,200,000		$ 3,200,000			3,200,000
Coverage limit			2,000
2026 - 2027 Reinsurance Program \| Insurance Claims
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Unpaid losses and loss adjustment expenses	8,000		$ 8,000			8,000
2026 - 2027 Reinsurance Program \| NBIC
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsured risk percentage			100.00%
2026 - 2027 Reinsurance Program \| NBIC \| Insurance Claims \| Commercial Residential Losses
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance payable	24,000		$ 24,000			24,000
2026 - 2027 Reinsurance Program \| First Catastrophe \| Osprey
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
First event retention for insurance company subsidiary	50,000		50,000			50,000
Property Per Risk Coverage
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Coverage limit			8,000
Reinsurance payable	24,000		24,000			24,000
Property Per Risk Coverage \| NBIC \| Insurance Claims
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Coverage limit			500
Maximum \| Facultative Reinsurance
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance payable	10,000		10,000			10,000
Maximum \| California HO E&S \| Facultative Reinsurance
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance payable	3,250		3,250			3,250
Maximum \| 2026 - 2027 Reinsurance Program \| First Catastrophe \| Osprey
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
First event retention for insurance company subsidiary	50,000		50,000			50,000
Maximum \| 2026 - 2027 Reinsurance Program \| First Catastrophe \| NBIC
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Retention under program to provide reinsurance coverage			1,245,000
First event retention for insurance company subsidiary	38,000		38,000			38,000
Maximum \| 2026 - 2027 Reinsurance Program \| First Catastrophe \| Heritage
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Retention under program to provide reinsurance coverage			1,865,000
First event retention for insurance company subsidiary	50,000		50,000			50,000
Maximum \| 2026 - 2027 Reinsurance Program \| First Catastrophe \| Zephyr
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Retention under program to provide reinsurance coverage			1,000,000
First event retention for insurance company subsidiary	$ 50,000		50,000			$ 50,000
Minimum \| Facultative Reinsurance
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Facultative reinsurance purchase amount			$ 10,000