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Condensed Financial Information of Parent Company - Summary of Condensed Statements of Income (Loss) and Comprehensive Income (Loss) (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
Revenues |  |  |  |  |  |  |  |  |  |  |
Realized investment gains |  |  |  |  |  |  |  |  | $ 21,984,617 | $ (4,801,509) | $ 5,705,255
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
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 1,579,299 | 2,302,082 | 1,593,437
Total expenses |  |  |  |  |  |  |  |  | 755,370,441 | 820,065,169 | 726,912,075
Income before income tax expense (benefit) and equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 57,081,030 | (48,236,849) | 12,114,462
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 9,929,286 | (15,476,509) | 4,998,362
Net income (loss) | 14,153,747 | 5,186,379 | 4,788,454 | 23,023,164 | (14,998,763) | 1,206,356 | (789,855) | (18,178,078) | 47,151,744 | (32,760,340) | 7,116,100
Statements of Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 14,153,747 | $ 5,186,379 | $ 4,788,454 | $ 23,023,164 | $ (14,998,763) | $ 1,206,356 | $ (789,855) | $ (18,178,078) | 47,151,744 | (32,760,340) | 7,116,100
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss)—subsidiaries |  |  |  |  |  |  |  |  | 14,848,545 | (7,019,532) | 3,811,151
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 61,883,973 | (39,385,469) | 7,161,783
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 4,000,000 | 11,000,000 | 13,000,000
Realized investment gains |  |  |  |  |  |  |  |  | 12,378,000 |  |
Other |  |  |  |  |  |  |  |  | 1,009,000 | 3,196,000 | 2,131,000
Total revenues |  |  |  |  |  |  |  |  | 17,387,000 | 14,196,000 | 15,131,000
Expenses |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  | 1,420,000 | 1,628,000 | 1,433,000
Interest |  |  |  |  |  |  |  |  | 1,327,000 | 2,224,000 | 1,929,000
Total expenses |  |  |  |  |  |  |  |  | 2,747,000 | 3,852,000 | 3,362,000
Income before income tax expense (benefit) and equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 14,640,000 | 10,344,000 | 11,769,000
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 636,000 | 411,000 | (690,000)
Income before equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 14,004,000 | 9,933,000 | 12,459,000
Equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 33,148,000 | (42,694,000) | (5,343,000)
Net income (loss) |  |  |  |  |  |  |  |  | 47,152,000 | (32,760,000) | 7,116,000
Statements of Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 47,152,000 | (32,760,000) | 7,116,000
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss)—subsidiaries |  |  |  |  |  |  |  |  | 14,732,000 | (6,625,000) | 46,000
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 14,732,000 | (6,625,000) | 46,000
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ 61,884,000 | $ (39,385,000) | $ 7,162,000

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