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Reinsurance Earned Premiums (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Direct Amount	$ 354,747	$ 376,288	$ 589,131
Ceded to Other Companies	12,206	29,542	122,556
Assumed from Other Companies	34,451	126,611	135,896
Net earned premiums	376,992	473,357	602,471
Property & Liability Insurance
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Direct Amount	354,747	376,288	589,131
Ceded to Other Companies	12,206	29,542	122,556
Assumed from Other Companies	34,451	126,611	135,896
Net earned premiums	$ 376,992	$ 473,357	$ 602,471
Percentage of Amount Assumed to Net	9.10%	26.70%	22.60%

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Percentage of assumed premium earned to premium earned after effects of reinsurance, as disclosed in supplementary reinsurance information.

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