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Summary of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Revenues:          
Gross written premiums $ 98,926 $ 175,827 $ 332,011 $ 563,633  
Net written premiums 95,623 142,835 317,480 469,475  
Net earned premiums 111,695 153,644 380,923 458,216  
Other income 299 316 935 839  
Total revenues 111,994 153,960 381,858 459,055  
Losses and Expenses:          
Net losses and loss adjustment expenses 65,116 88,459 231,199 265,772  
Acquisition costs and other underwriting expenses 46,202 60,876 146,781 178,666  
Income (loss) from segments 676 4,625 3,878 14,617  
Unallocated Items:          
Net investment income 14,200 8,389 39,424 16,911  
Net realized investment gains (133) 2,234 (2,414) (33,067)  
Other income (loss)   30,000   30,000  
Corporate and other operating expenses (5,280) (14,064) (16,638) (21,718)  
Interest expense 0 0 (12) (3,004)  
Loss on extinguishment of debt 0 0 0 (3,529)  
Income before income taxes 9,463 31,184 24,238 210  
Income tax benefit (expense) (1,763) (7,438) (4,707) (3,399)  
Net income (loss) 7,700 23,746 19,531 (3,189)  
Total assets 1,767,846 1,879,137 1,767,846 1,879,137 $ 1,800,775
Segment Assets          
Unallocated Items:          
Total assets 1,593,253 1,705,040 1,593,253 1,705,040  
Corporate Assets          
Unallocated Items:          
Total assets 174,593 174,097 174,593 174,097  
Commercial Specialty          
Revenues:          
Gross written premiums 87,029 96,056 277,884 303,914  
Net written premiums 84,103 93,172 267,233 291,002  
Net earned premiums 83,679 98,597 270,269 283,791  
Other income 275 272 808 791  
Total revenues 83,954 98,869 271,077 284,582  
Losses and Expenses:          
Net losses and loss adjustment expenses 63,624 56,833 182,405 163,296  
Acquisition costs and other underwriting expenses 32,671 37,817 102,169 106,886  
Income (loss) from segments (12,341) 4,219 (13,497) 14,400  
Commercial Specialty | Segment Assets          
Unallocated Items:          
Total assets 1,020,613 996,336 1,020,613 996,336  
Reinsurance Operations          
Revenues:          
Gross written premiums [1] 11,864 43,055 50,124 130,575  
Net written premiums [1] 11,864 43,055 50,124 130,575  
Net earned premiums [1] 26,671 35,046 91,103 108,506  
Other income [1] 0 0 0 0  
Total revenues [1] 26,671 35,046 91,103 108,506  
Losses and Expenses:          
Net losses and loss adjustment expenses [1] 13,673 20,316 54,448 64,168  
Acquisition costs and other underwriting expenses [1] 10,553 13,013 34,106 39,527  
Income (loss) from segments [1] 2,445 1,717 2,549 4,811  
Reinsurance Operations | Segment Assets          
Unallocated Items:          
Total assets [1] 386,026 372,036 386,026 372,036  
Exited Lines          
Revenues:          
Gross written premiums 33 36,716 4,003 129,144  
Net written premiums (344) 6,608 123 47,898  
Net earned premiums 1,345 20,001 19,551 65,919  
Other income 24 44 127 48  
Total revenues 1,369 20,045 19,678 65,967  
Losses and Expenses:          
Net losses and loss adjustment expenses (12,181) 11,310 (5,654) 38,308  
Acquisition costs and other underwriting expenses 2,978 10,046 10,506 32,253  
Income (loss) from segments 10,572 (1,311) 14,826 (4,594)  
Exited Lines | Segment Assets          
Unallocated Items:          
Total assets $ 186,614 $ 336,668 $ 186,614 $ 336,668  
[1] External business only, excluding business assumed from affiliates.