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Condensed Financial Information of Parent Company - Summary of Condensed Balance Sheets (Detail) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Short-term investments | $ 14,030,222 | $ 16,748,760 |  |
Cash | 49,318,930 | 52,594,461 | $ 37,833,435 | $ 24,587,214
Property and equipment | 4,558,072 | 4,690,704 |  |
Total assets | 1,923,161,131 | 1,832,078,267 |  |
Liabilities [Abstract] |  |  |  |
Cash dividends declared to stockholders | 4,075,234 | 3,948,484 |  |
Borrowings under lines of credit | 35,000,000 | 60,000,000 |  |
Other | 7,524,095 | 1,863,363 |  |
Total liabilities | 1,472,145,612 | 1,433,208,366 |  |
Stockholders' equity | 451,015,519 | 398,869,901 | 448,696,104 | 438,615,320
Total liabilities and stockholders' equity | 1,923,161,131 | 1,832,078,267 |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Investment in subsidiaries/affiliates (equity method) | 489,657,000 | 465,030,000 |  |
Short-term investments | 2,502,000 | 29,000 |  |
Cash | 2,350,000 | 1,542,000 | $ 3,237,000 | $ 1,820,000
Property and equipment | 944,000 | 928,000 |  |
Total assets | 495,453,000 | 467,529,000 |  |
Liabilities [Abstract] |  |  |  |
Cash dividends declared to stockholders | 4,075,000 | 3,948,000 |  |
Borrowings under lines of credit | 35,000,000 | 60,000,000 |  |
Other | 5,362,000 | 4,711,000 |  |
Total liabilities | 44,437,000 | 68,659,000 |  |
Stockholders' equity | 451,016,000 | 398,870,000 |  |
Total liabilities and stockholders' equity | $ 495,453,000 | $ 467,529,000 |  |

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