v3.26.1
Segment Information - Summary of Segment Information Reconciled to Consolidated Statements of Income (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting Information [Line Items]        
Gross premiums earned $ 320,824 [1] $ 302,628 [2] $ 647,030 [3] $ 603,011 [4]
Insurance Operation [Member]        
Segment Reporting Information [Line Items]        
Gross premiums earned   $ 1,280 $ 3,376 $ 2,479
Reciprocal Exchange Operation [Member]        
Segment Reporting Information [Line Items]        
Gross premiums earned $ 1,974      
[1] Gross premiums earned under Insurance Operations included $1,974 earned from Reciprocal Exchange Operations.
[2] Gross premiums earned under Insurance Operations included $1,280 earned from Reciprocal Exchange Operations.
[3] Gross premiums earned under Insurance Operations included $3,376 earned from Reciprocal Exchange Operations.
[4] Gross premiums earned under Insurance Operations included $2,479 earned from Reciprocal Exchange Operations.