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Background and Business Description - Additional Information (Detail)
 12 Months Ended
Apr. 29, 1991
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2017
Jul. 06, 2021
USD ($)
Apr. 30, 2013
$ / shares
Background And Basis Of Presentation [Line Items]              
Common stock, shares authorized | shares   130,000,000 130,000,000        
Common Stock, Par or Stated Value Per Share | $ / shares             $ 0.01
Preferred stock, shares authorized | shares   20,000,000 20,000,000        
Preferred Stock, Par or Stated Value Per Share | $ / shares   $ 0.01         $ 0.01
Common stock, shares issued | shares   46,659,144 46,658,990        
Common Stock Voting Restriction Less One Vote 10.00%            
Common Stock Transfer Restrictions 5.00%            
Common Stock Additional Transfer Restrictions         5.00%    
Financial Guarantee Insurance Contracts, Accelerated Premium Revenue, Amount | $   $ 0 $ 8,000,000 $ 1,000,000      
Number of Admitted Carriers Owned | $   5          
Number of Reportable Segments   3          
Number of Admitted Carriers Acquired in 2022   3          
LIBOR + 4.5% Senor Secured Notes Due 2026 | London Interbank Offered Rate (LIBOR) [Member]              
Background And Basis Of Presentation [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage           4.50%  
Sitka Holdings, LLC | LIBOR + 4.5% Senor Secured Notes Due 2026              
Background And Basis Of Presentation [Line Items]              
Debt Instrument, Face Amount | $           $ 1,175,000,000