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Segment Information - Summary of Financial Data by Segment (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Premiums earned: |  |  |  |  |  |  |  |  |  |  |
Premiums earned | $ 189,420,787 | $ 189,821,058 | $ 188,763,313 | $ 188,073,242 | $ 186,150,478 | $ 187,661,705 | $ 185,714,110 | $ 181,764,580 | $ 756,078,400 | $ 741,290,873 | $ 702,514,755
Net investment income |  |  |  |  |  |  |  |  | 29,514,955 | 26,907,656 | 23,527,304
Investment gains (losses) |  |  |  |  |  |  |  |  | 21,984,617 | (4,801,509) | 5,705,255
Equity in earnings of DFSC |  |  |  |  |  |  |  |  | 295,000 | 2,693,962 | 1,621,605
Other |  |  |  |  |  |  |  |  | 4,578,000 | 5,737,000 | 5,658,000
Total revenues | $ 200,938,743 | $ 198,009,900 | $ 198,788,954 | $ 214,713,874 | $ 186,805,834 | $ 199,904,180 | $ 195,790,028 | $ 189,328,278 | 812,451,471 | 771,828,320 | 739,026,537
Underwriting income (loss): |  |  |  |  |  |  |  |  |  |  |
SAP underwriting income (loss) |  |  |  |  |  |  |  |  | 6,787,000 | (75,649,000) | (25,779,000)
GAAP adjustments |  |  |  |  |  |  |  |  | (3,079,000) | 894,000 | 4,408,000
GAAP underwriting income (loss) |  |  |  |  |  |  |  |  | 3,708,000 | (74,755,000) | (21,371,000)
Net investment income |  |  |  |  |  |  |  |  | 29,514,955 | 26,907,656 | 23,527,304
Investment gains (losses) |  |  |  |  |  |  |  |  | 21,984,617 | (4,801,509) | 5,705,255
Equity in earnings of DFSC |  |  |  |  |  |  |  |  | 295,000 | 2,693,962 | 1,621,605
Other |  |  |  |  |  |  |  |  | 1,578,000 | 1,718,000 | 2,631,000
Income (loss) before income tax expense (benefit) |  |  |  |  |  |  |  |  | 57,081,030 | (48,236,849) | 12,114,462
Commercial Lines [Member] |  |  |  |  |  |  |  |  |  |  |
Premiums earned: |  |  |  |  |  |  |  |  |  |  |
Premiums earned |  |  |  |  |  |  |  |  | 385,465,000 | 337,924,000 | 318,391,000
Underwriting income (loss): |  |  |  |  |  |  |  |  |  |  |
SAP underwriting income (loss) |  |  |  |  |  |  |  |  | 8,404,000 | (22,059,000) | 13,263,000
Personal Lines [Member] |  |  |  |  |  |  |  |  |  |  |
Premiums earned: |  |  |  |  |  |  |  |  |  |  |
Premiums earned |  |  |  |  |  |  |  |  | 370,613,000 | 403,367,000 | 384,124,000
Underwriting income (loss): |  |  |  |  |  |  |  |  |  |  |
SAP underwriting income (loss) |  |  |  |  |  |  |  |  | $ (1,617,000) | $ (53,590,000) | $ (39,042,000)

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