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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 06, 2025
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jan. 16, 2025
Subsequent Event [Line Items]            
Common shares, shares authorized     900,000,000 900,000,000    
Dividend payable, per share     $ 0.35 $ 0.25 $ 0.25  
Expected pretax net catastrophe losses     $ 213,190 $ 289,153 $ 359,228  
California Wildfires | Forecast            
Subsequent Event [Line Items]            
Expected pretax net catastrophe losses   $ 15,600        
Subsequent Event            
Subsequent Event [Line Items]            
Dividend payable, per share $ 0.35          
Subsequent Event | O2025 Q1 Dividends            
Subsequent Event [Line Items]            
Approval Date Mar. 06, 2025          
Payment Date Mar. 28, 2025          
Record Date Mar. 21, 2025          
Fox Paine & Company, LLC. | Subsequent Event            
Subsequent Event [Line Items]            
Additional consideration in cash for services $ 200          
Class A Common Shares Designated as Class A-2 Common Shares | Subsequent Event            
Subsequent Event [Line Items]            
Distributions pecentage 100.00%          
Class A Common Shares Designated as Class A-2 Common Shares | Amendment of Limited Liability Company Agreement | Subsequent Event            
Subsequent Event [Line Items]            
Common shares, shares authorized           5,000,000
Class A Common Shares Designated as Class A-2 Common Shares | Fox Paine & Company, LLC. | Forecast            
Subsequent Event [Line Items]            
Advisory services fee   $ 2,700        
Class A Common Shares Designated as Class A-2 Common Shares | Fox Paine & Company, LLC. | Subsequent Event            
Subsequent Event [Line Items]            
Common shares issued 550,000          
Threshold amount $ 475,300          
Consecutive calendar days 30 days          
Share based payment, grant date fair value $ 11,000          
Professional fees recognized upon change of control $ 8,300          
Volume weighted average closing sale price $ 34.67          
Class A Common Shares            
Subsequent Event [Line Items]            
Common shares, shares outstanding     9,914,587 9,771,429    
Class B Common Shares            
Subsequent Event [Line Items]            
Common shares, shares outstanding     3,793,612 3,793,612    
Common Class A and B Shares | Fox Paine & Company, LLC. | Subsequent Event            
Subsequent Event [Line Items]            
Common shares, shares outstanding 13,708,199