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Reconciliation of Net Incurred and Paid Claims Development Tables to Liability for Unpaid Losses and Loss Adjustment Expenses in Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance $ 735,088      
Reinsurance recoverable on unpaid claims 70,774      
Total other outstanding liabilities 26,542      
Total gross liability for unpaid losses and loss adjustment expenses 832,404 $ 759,904 $ 662,811 $ 630,181
Commercial Specialty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Ceded Allowance 8,992      
Unallocated claims adjustment expenses 595      
Loss Clearing (918)      
Commercial Specialty | Property Insurance        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 47,500      
Reinsurance recoverable on unpaid claims 5,951      
Commercial Specialty | Casualty Insurance        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 380,628      
Reinsurance recoverable on unpaid claims 45,273      
Reinsurance Operations        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unallocated claims adjustment expenses 2,042      
Reinsurance Operations | Casualty Insurance        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 179,608      
Reinsurance recoverable on unpaid claims 0      
Exited Lines Segment        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Fronted business ceded to Assurant 2,189      
Unallocated claims adjustment expenses 14,818      
Other (1,176)      
Exited Lines Segment | Property Insurance        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 89,018      
Reinsurance recoverable on unpaid claims 19,590      
Exited Lines Segment | Casualty Insurance        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 38,334      
Reinsurance recoverable on unpaid claims $ (40)