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Supplementary Insurance Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplementary Insurance Information, by Segment [Line Items]      
Premium Revenue $ 602,471 $ 595,610 $ 567,699
Benefits, Claims, Losses And Settlement Expenses 359,228 384,964 336,201
Amortization of Deferred Policy Acquisition Costs 150,946 144,944 140,915
Net Written Premium 591,331 580,068 548,167
Commercial Specialty      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred Policy Acquisition Costs 34,953 33,264 28,701
Future Policy Benefits, Losses, Claims And Loss Expenses 498,102 459,174 393,933
Unearned Premiums 162,588 156,842 135,015
Other Policy and Benefits Payable 0 0 0
Premium Revenue 377,953 331,503 277,892
Benefits, Claims, Losses And Settlement Expenses 225,389 202,176 140,388
Amortization of Deferred Policy Acquisition Costs 85,530 74,337 60,806
Net Written Premium 383,682 353,105 288,745
Reinsurance Operations      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred Policy Acquisition Costs 25,907 18,366 8,910
Future Policy Benefits, Losses, Claims And Loss Expenses 180,203 102,006 57,881
Unearned Premiums 72,779 55,355 28,329
Other Policy and Benefits Payable 0 0 0
Premium Revenue 141,287 76,663 46,105
Benefits, Claims, Losses And Settlement Expenses 85,385 48,064 28,718
Amortization of Deferred Policy Acquisition Costs 49,673 25,027 14,199
Net Written Premium 158,711 103,690 55,616
Exited Lines      
Supplementary Insurance Information, by Segment [Line Items]      
Deferred Policy Acquisition Costs 4,034 8,701 27,584
Future Policy Benefits, Losses, Claims And Loss Expenses 154,099 198,724 210,997
Unearned Premiums 33,986 104,369 128,151
Other Policy and Benefits Payable 0 0 0
Premium Revenue 83,231 187,444 243,702
Benefits, Claims, Losses And Settlement Expenses 48,454 134,724 167,095
Amortization of Deferred Policy Acquisition Costs 15,743 45,580 65,910
Net Written Premium $ 48,938 $ 123,273 $ 203,806