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Supplementary Insurance Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Supplementary Insurance Information, by Segment [Line Items]      
Premium Revenue $ 376,992 $ 473,357 $ 602,471
Benefits, Claims, Losses And Settlement Expenses 213,190 289,153 359,228
Amortization of Deferred Policy Acquisition Costs 87,635 120,883 150,946
Net Written Premium 379,190 399,319 591,331
Penn-America      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred Policy Acquisition Costs 40,091 34,908 34,290
Future Policy Benefits, Losses, Claims And Loss Expenses 445,186 408,720 366,133
Unearned Premiums 180,310 161,135 159,554
Other Policy and Benefits Payable 0 0 0
Premium Revenue 369,806 354,518 359,597
Benefits, Claims, Losses And Settlement Expenses 210,293 233,239 214,854
Amortization of Deferred Policy Acquisition Costs 84,691 80,226 81,638
Net Written Premium 389,582 356,796 370,306
Non-Core Operations      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred Policy Acquisition Costs 1,045 7,537 30,604
Future Policy Benefits, Losses, Claims And Loss Expenses 355,205 441,879 466,271
Unearned Premiums 3,101 21,717 109,799
Other Policy and Benefits Payable 0 0 0
Premium Revenue 7,186 118,839 242,874
Benefits, Claims, Losses And Settlement Expenses 2,897 55,914 144,374
Amortization of Deferred Policy Acquisition Costs 2,944 40,657 69,308
Net Written Premium $ (10,392) $ 42,523 $ 221,025