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Shareholders' Equity - Additional Information (Detail)
 12 Months Ended
Nov. 14, 2022
shares
Oct. 21, 2022
Dec. 31, 2024
USD ($)
Stockholder
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Mar. 06, 2025
$ / shares
Equity [Line Items]            
Dividend declared, per share | $ / shares     $ 1.4 $ 1 $ 1.00  
Dividend payable, per share | $ / shares     $ 0.35 $ 0.25 $ 0.25  
Distribution paid to preferred shareholders     $ 400,000 $ 400,000 $ 400,000  
Accrued distributions     0 300,000    
Stock repurchase program, remaining authorization to repurchase shares     101,000,000      
Stock repurchase program, authorized amount     135,000,000      
Stock repurchase program expiration date   Dec. 31, 2027        
Treasury stock acquired book value per share increased | $ / shares         $ 1.69  
Subsequent Event            
Equity [Line Items]            
Dividend payable, per share | $ / shares           $ 0.35
Maximum            
Equity [Line Items]            
Accrued preferred distributions     $ 100,000 $ 100,000    
Series A Cumulative Fixed Rate Perpetual Preferred Interests            
Equity [Line Items]            
Number of shareholders | Stockholder     1      
Class A Common Shares            
Equity [Line Items]            
Conversion of stock number of shares issued | shares 153,594          
Shares surrendered, repurchased or redeemed | shares     16,527 [1] 468,860 [2]    
Voting rights     one      
Number of shareholders | Stockholder     140      
Stock repurchase program, authorized amount     $ 135,000,000 $ 135,000,000    
Price per share | $ / shares     $ 32 [1] $ 27.04 [2]    
Class B Common Shares            
Equity [Line Items]            
Shares surrendered, repurchased or redeemed | shares     0 0    
Voting rights     ten      
Class B Common Shares | Fox Paine Entities            
Equity [Line Items]            
Number of shareholders | Stockholder     2      
Treasury Stock Common | Share Repurchase Program            
Equity [Line Items]            
Stock repurchase program, number of shares purchased | shares     1,357,082      
Stock repurchase program, value of shares purchased     $ 34,000,000      
Price per share | $ / shares     $ 25.05      
Treasury Stock Common | Directors            
Equity [Line Items]            
Shares issued, price per share | $ / shares         $ 24.17  
Treasury Shares Reissued to Director of Global Indemnity Group, LLC | shares         138,151  
Treasury Stock Common | Class A Common Shares            
Equity [Line Items]            
Stock repurchase program, number of shares purchased | shares     16,527 468,860 923,036  
Stock repurchase program, value of shares purchased     $ 529,000 $ 12,677,000 $ 22,335,000  
Treasury Stock Common | Class A Common Shares | Directors            
Equity [Line Items]            
Stock repurchase program, number of shares purchased | shares     0 0 (138,151)  
Stock repurchase program, value of shares purchased     $ 0 $ 0 $ (3,339,000)  
Employee Stock | Treasury Stock Common | Class A Common Shares            
Equity [Line Items]            
Stock repurchase program, number of shares purchased | shares     16,527 18,860 15,954  
Stock repurchase program, value of shares purchased     $ 500,000 $ 600,000 $ 400,000  
[1] Based on settlement date.
[2] Based on settlement date.