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Stock-Based Compensation - SAR Activity (Detail) - Stock Appreciation Rights [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule Of Stock Appreciation Rights Activity [Line Items] |  |  |
SARs Outstanding, Beginning Balance | 262,077 | 515,830 | 739,194
Granted, SARs |  | 15,585 | 3,866
Exercised, SARs | (124,352) | (263,626) | (218,826)
Canceled, SARs |  | (5,712) | (8,404)
Shares Outstanding, SARs, Ending Balance | 137,725 | 262,077 | 515,830
Outstanding, Weighted Average Grant Price Per Share, Beginning Balance | $ 13.13 | $ 13.98 | $ 12.93
Vested, SARs | 127,469 |  |
Granted, Weighted Average Grant Price Per Share |  | 41.19 | 37.88
Exercisable, SARs | 127,469 |  |
Exercised, Weighted Average Grant Price Per Share | $ 11.09 | 13.86 | 10.96
Canceled, Weighted Average Grant Price Per Share |  | 21.94 | 4.74
Outstanding, Weighted Average Grant Price Per Share, Ending Balance | 19.57 | $ 13.13 | $ 13.98
Vested, Weighted Average Grant Price Per Share | 17.83 |  |
Exercisable, Weighted Average Grant Price Per Share | $ 17.83 |  |
Weighted Average Remaining Contractual Life, Outstanding | 5 years 7 months 6 days |  |
Weighted Average Remaining Contractual Life, Vested | 5 years 4 months 24 days |  |
Weighted Average Remaining Contractual Life, Exercisable | 5 years 4 months 24 days |  |
Aggregate Intrinsic Value, Outstanding | $ 6,174,886 |  |
Aggregate Intrinsic Value, Vested | 5,936,639 |  |
Aggregate Intrinsic Value, Exercisable | $ 5,936,639 |  |

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