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Reinsurance - Schedule of Unsecured Reinsurance Recoverables from Reinsurers (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables $ 125,677 $ 120,561
Allowance for credit losses (372) $ (440)
Funds withheld and letters of credit related to the above recoverables (80,549)  
Total unsecured amounts recoverable from reinsurers 45,128  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables 125,677  
Total amounts recoverable from reinsurers 126,049  
Allowance for credit losses (372)  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk | Hannover Reinsurance (Ireland) Limited [Member] | A.M. Best Rating, A+ [Member]    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables [1] 63,987  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk | Arch Reinsurance Company    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables [1] 11,358  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk | Allianz Risk Transfer AG (Bermuda) [Member] | A.M. Best Rating, A+ [Member]    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables 9,489  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk | Minnesota Workers' Compensation Reinsurance Association [Member]    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables [1] 8,567  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk | Odyssey America Reinsurance Corporation [Member] | A.M. Best Rating, A [Member]    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables 6,516  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk | Other Reinsurers [Member]    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables $ 26,132  
[1] Current participant in our 2023 reinsurance program.