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Reinsurance - Schedule of Unsecured Reinsurance Recoverables from Reinsurers (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables $ 105,803 $ 95,913
Allowance for credit losses (452) $ 0
Funds withheld and letters of credit related to the above recoverables (71,986)  
Total unsecured amounts recoverable from reinsurers 33,817  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables 105,803  
Total amounts recoverable from reinsurers 106,255  
Allowance for credit losses (452)  
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] 56,753  
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 12,050  
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 8,688  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk | Minnesota Workers' Compensation Reinsurance Association [Member]    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables [1] 6,367  
Reinsurance Recoverable [Member] | Reinsurer Concentration Risk | Other Reinsurers [Member]    
Ceded Credit Risk [Line Items]    
Total reinsurance recoverables $ 22,397  
[1] Current participant in our 2021 reinsurance program.