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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance $ 724,594      
Reinsurance recoverable on unpaid claims 60,754      
Total other outstanding liabilities 15,043      
Total gross liability for unpaid losses and loss adjustment expenses 800,391 $ 850,599 $ 832,404 $ 759,904
Property & Liability Insurance        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total gross liability for unpaid losses and loss adjustment expenses 800,391      
Non-Core Operations        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Ceded Allowance 8,992      
Unallocated claims adjustment expenses 5,006      
Loss Clearing (8,169)      
Other (927)      
Non-Core Operations | 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 42,357      
Reinsurance recoverable on unpaid claims 19,264      
Non-Core 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 256,226      
Reinsurance recoverable on unpaid claims 32,456      
Penn-America        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Ceded Allowance 0      
Unallocated claims adjustment expenses 11,534      
Loss Clearing (1,393)      
Penn-America | 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 49,907      
Reinsurance recoverable on unpaid claims 2,199      
Penn-America | 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 376,104      
Reinsurance recoverable on unpaid claims $ 6,835