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Stock-Based Compensation - SAR Activity (Detail) - Stock Appreciation Rights [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule Of Stock Appreciation Rights Activity [Line Items] |  |  |
SARs Outstanding, Beginning Balance | 515,830 | 739,194 | 1,374,380
Granted, SARs | 15,585 | 3,866 | 121,176
Exercised, SARs | (263,626) | (218,826) | (749,334)
Canceled, SARs | (5,712) | (8,404) | (7,028)
Shares Outstanding, SARs, Ending Balance | 262,077 | 515,830 | 739,194
Outstanding, Weighted Average Grant Price Per Share, Beginning Balance | $ 13.98 | $ 12.93 | $ 9.28
Vested, SARs | 229,415 |  |
Granted, Weighted Average Grant Price Per Share | $ 41.19 | 37.88 | 21.95
Exercisable, SARs | 229,415 |  |
Exercised, Weighted Average Grant Price Per Share | $ 13.86 | 10.96 | 7.70
Canceled, Weighted Average Grant Price Per Share | 21.94 | 4.74 | 13.10
Outstanding, Weighted Average Grant Price Per Share, Ending Balance | 13.13 | $ 13.98 | $ 12.93
Vested, Weighted Average Grant Price Per Share | 13.34 |  |
Exercisable, Weighted Average Grant Price Per Share | $ 13.34 |  |
Weighted Average Remaining Contractual Life, Outstanding | 5 years 8 months 12 days |  |
Weighted Average Remaining Contractual Life, Vested | 5 years 3 months 18 days |  |
Weighted Average Remaining Contractual Life, Exercisable | 5 years 3 months 18 days |  |
Aggregate Intrinsic Value, Outstanding | $ 5,948,519 |  |
Aggregate Intrinsic Value, Vested | 5,670,343 |  |
Aggregate Intrinsic Value, Exercisable | $ 5,670,343 |  |

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