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Income Taxes - Narrative (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |
Income tax expense | $ 5,862,733 | $ 3,702,100 |
Effective tax rate | 23.10% | 22.20% |
Federal statutory income tax rate, percent | 21.00% | 21.00% |
Valuation allowance | $ 0 |  | $ 0
Interest and penalties | $ 0 |  |
Parent Company |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective tax rate | 25.70% |  |

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