v3.26.3
Equity (Noncontrolling Interest) - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2026
Sep. 30, 2025
Aug. 31, 2026
May 01, 2026
Dec. 31, 2025
Class of Stock [Line Items]            
Common stock, outstanding 12,437,958 12,437,958       12,992,147
Repurchases of common stock, Value $ 5,589,000 $ 80,810,000        
Remaining authorized amount $ 75,000,000 $ 75,000,000   $ 25,000,000    
Stock Repurchased During Period, Shares 30,721 504,330        
Share Repurchase Program, Remaining Authorized, Amount $ 75,000,000 $ 75,000,000   $ 25,000,000    
Payment of net share settlements of noncontrolling interests and other   $ (62,000) $ (0)      
Common Stock [Member]            
Class of Stock [Line Items]            
Stock Repurchased During Period, Shares 30,721 504,330        
Share Repurchase Program [Member]            
Class of Stock [Line Items]            
Repurchases of common stock, Value $ 5,534,000 $ 80,000,000        
Exzeo Group Inc [Member]            
Class of Stock [Line Items]            
Common stock, outstanding 89,715,825 89,715,825        
Repurchases of common stock, Value $ 1,971,000 $ 12,000,000        
Common stock shares outstanding owned by consolidating entity 75,000,000 75,000,000        
Stock Repurchased During Period, Shares 107,422 834,250        
Stock Repurchase Program Authroized Amount 1         $ 12,000,000  
HCI, unvested restricted stock awards   2,458,673        
Exzeo Share Repurchase Program [Member]            
Class of Stock [Line Items]            
Repurchases of common stock, Value $ 4,980,000 $ 4,980,000        
Remaining authorized amount $ 20,020,000 $ 20,020,000        
Stock Repurchased During Period, Shares 303,163 303,163        
Share Repurchase Program, Remaining Authorized, Amount $ 20,020,000 $ 20,020,000