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Income Taxes - Narrative (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense | $ 4,442,023 | $ 5,017,185 | $ 10,304,756 | $ 8,719,285
Effective tax rate |  |  | 23.40% | 23.80%
Federal statutory income tax rate, percent |  |  | 21.00% | 21.00%
Parent Company |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective tax rate |  |  | 25.50% |

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