v3.26.3
Segment Information - Summary of Segment Assets Reconciled to Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Segment Reporting Information [Line Items]    
Total assets $ 2,713,762 $ 2,528,928
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total assets 2,713,762 2,528,928
Consolidation, Eliminations [Member]    
Segment Reporting Information [Line Items]    
Total assets (186,305) (149,997)
Insurance Operation [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total assets 1,997,389 1,895,081
Exzeo Group Inc | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total assets 397,494 347,734
Reciprocal Exchange Operation [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total assets 261,705 184,453
Real Estate Operations [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total assets 136,326 130,971
Corporate and Other [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total assets $ 107,153 $ 120,686