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Reinsurance Earned Premiums (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Direct Amount $ 589,131 $ 578,171 $ 560,658
Ceded to Other Companies 122,556 61,441 62,271
Assumed from Other Companies 135,896 78,880 69,312
Net earned premiums 602,471 595,610 567,699
Property & Liability Insurance      
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]      
Direct Amount 589,131 578,171 560,658
Ceded to Other Companies 122,556 61,441 62,271
Assumed from Other Companies 135,896 78,880 69,312
Net earned premiums $ 602,471 $ 595,610 $ 567,699
Percentage of Amount Assumed to Net 22.60% 13.20% 12.20%