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Reinsurance - Schedule of Unsecured Reinsurance Recoverables from Reinsurers (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables $ 120,561 $ 105,803
Allowance for credit losses (440) $ (452)
Funds withheld and letters of credit related to the above recoverables (74,489)  
Total unsecured amounts recoverable from reinsurers 46,072  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables 120,561  
Total amounts recoverable from reinsurers 121,001  
Allowance for credit losses (440)  
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] 58,128  
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 10,654  
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 7,665  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk | Minnesota Workers' Compensation Reinsurance Association [Member]    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables [1] 8,663  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk | Arch Reinsurance Company    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables [1] 8,147  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk | Other Reinsurers [Member]    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables $ 27,744  
[1] Current participant in our 2022 reinsurance program.