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Shareholders' Equity - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Jan. 03, 2023
USD ($)
Nov. 14, 2022
shares
Oct. 21, 2022
USD ($)
Apr. 05, 2021
shares
Aug. 27, 2020
USD ($)
Memberofboardofdirector
$ / shares
shares
Dec. 31, 2017
$ / shares
Dec. 31, 2022
USD ($)
Stockholder
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2017
$ / shares
Mar. 02, 2023
$ / shares
Equity [Line Items]                      
Dividend declared, per share | $ / shares             $ 1.00 $ 1.00 $ 1.00    
Dividend payable, per share | $ / shares             $ 0.25 $ 0.25 $ 0.25    
Distribution paid to preferred shareholders             $ 400,000 $ 400,000 $ 100,000    
Accrued distributions             $ 1,100,000 900,000      
Stock repurchase program, authorized amount     $ 32,000,000                
Stock repurchase program expiration date     Dec. 31, 2027                
Treasury stock acquired book value per share increased | $ / shares             $ 1.09        
Subsequent Event                      
Equity [Line Items]                      
Dividend payable, per share | $ / shares                     $ 0.25
Stock repurchase program, authorized amount $ 60,000,000                    
Stock repurchase program expiration date Dec. 31, 2027                    
Maximum                      
Equity [Line Items]                      
Accrued preferred distributions             $ 100,000 $ 100,000      
Quarterly Dividend                      
Equity [Line Items]                      
Dividend declared, per share | $ / shares           $ 0.25          
Annual Dividend                      
Equity [Line Items]                      
Dividend declared, per share | $ / shares                   $ 1.00  
Series A Preferred Interest                      
Equity [Line Items]                      
Preferred shares issued | shares         4,000            
Shares issued, price per share | $ / shares         $ 1,000            
Preferred shares issued         $ 4,000,000            
Preferred shareholders entitled to appoint number of additional members to board of directors | Memberofboardofdirector         2            
Class A Common Shares                      
Equity [Line Items]                      
Conversion of stock number of shares issued | shares   153,594   186,160              
Shares surrendered, repurchased or redeemed | shares             923,036 [1] 17,318      
Voting rights             one        
Number of shareholders | Stockholder             150        
Stock repurchase program, authorized amount     $ 32,000,000                
Price per share | $ / shares             $ 24.20 [1] $ 28.30      
Class A Common Shares | Subsequent Event                      
Equity [Line Items]                      
Stock repurchase program, authorized amount $ 60,000,000                    
Class A Common Shares | Maximum                      
Equity [Line Items]                      
Stock repurchase program, authorized amount     $ 32,000,000                
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        
Additional Paid-in Capital                      
Equity [Line Items]                      
Offset treasury shares due to redomestication             $ 4,100,000        
Treasury Shares                      
Equity [Line Items]                      
Offset treasury shares due to redomestication             $ 0 $ 0 $ 4,126,000    
Shares issued, price per share | $ / shares             $ 24.17        
Treasury Shares | Share Repurchase Program                      
Equity [Line Items]                      
Stock repurchase program, number of shares purchased | shares             907,082        
Stock repurchase program, value of shares purchased             $ 21,900,000        
Price per share | $ / shares             $ 24.17        
Treasury Shares | Directors                      
Equity [Line Items]                      
Treasury Shares Reissued to Director of Global Indemnity Group, LLC | shares             138,151        
Treasury Shares | Class A Common Shares                      
Equity [Line Items]                      
Stock repurchase program, number of shares purchased | shares             923,036 17,318 5,120    
Stock repurchase program, value of shares purchased             $ 22,335,000 $ 490,000 $ 153,000    
Treasury Shares | Class A Common Shares | Directors                      
Equity [Line Items]                      
Stock repurchase program, number of shares purchased | shares             (138,151) (0) (0)    
Stock repurchase program, value of shares purchased             $ (3,339,000) $ 0 $ 0    
Employee Stock | Treasury Shares | Class A Common Shares                      
Equity [Line Items]                      
Stock repurchase program, number of shares purchased | shares             15,954 17,318 5,120    
Stock repurchase program, value of shares purchased             $ 400,000 $ 500,000 $ 200,000    
[1] Based on settlement date.