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Stock-Based Compensation - SAR Activity (Detail) - Stock Appreciation Rights [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Stock Appreciation Rights Activity [Line Items] |  |  |
SARs Outstanding, Beginning Balance | 278,116 | 275,450 | 524,154
Granted, SARs | 21,260 | 37,478 |
Exercised, SARs | (60,900) | (34,812) | (248,704)
Canceled, SARs | 0 | 0 | 0
Shares Outstanding, SARs, Ending Balance | 238,476 | 278,116 | 275,450
Outstanding, Weighted Average Grant Price Per Share, Beginning Balance | $ 13.45 | $ 9.79 | $ 6.57
Vested, SARs | 192,232 |  |
Granted, Weighted Average Grant Price Per Share | $ 56.59 | 35.38 |
Exercisable, SARs | 192,232 |  |
Exercised, Weighted Average Grant Price Per Share | $ 5.27 | 8.07 | 5.55
Canceled, Weighted Average Grant Price Per Share | 0 | 0 | 0
Outstanding, Weighted Average Grant Price Per Share, Ending Balance | 19.26 | $ 13.45 | $ 9.79
Vested, Weighted Average Grant Price Per Share | 13.08 |  |
Exercisable, Weighted Average Grant Price Per Share | $ 13.08 |  |
Weighted Average Remaining Contractual Life, Outstanding | 5 years 3 months 18 days |  |
Weighted Average Remaining Contractual Life, Vested | 4 years 6 months |  |
Weighted Average Remaining Contractual Life, Exercisable | 4 years 6 months |  |
Aggregate Intrinsic Value, Outstanding | $ 9,562,603 |  |
Aggregate Intrinsic Value, Vested | 8,896,335 |  |
Aggregate Intrinsic Value, Exercisable | $ 8,896,335 |  |

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