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Common Stock and Treasury Stock - Additional Information (Detail) - USD ($) | 12 Months Ended | 48 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Feb. 28, 2014 | Jul. 31, 2013 | Sep. 13, 2012 | Feb. 29, 2012 | Dec. 31, 2011
Maximum stock authorized to purchase under stock repurchase program |  |  |  |  |  |  |  | $ 262,100,000 | $ 210,000,000
Increase in maximum stock authorized to purchase under stock repurchase program |  |  |  |  | $ 100,000,000 | $ 100,000,000 |  | $ 52,100,000 |
Repurchase of common stock, shares | 0 | 3,578,427 | 4,970,424 | 37,108,467 |  |  |  |  |
Repurchase of common stock, value |  | $ 70,000,000 | $ 80,912,000 | $ 395,800,000 |  |  |  |  |
Number shares issued pursuant to stock option exercises | 1,144,273 | 2,036,558 | 2,478,183 |  |  |  |  |  |
Long-term incentive program performance share awards |  |  |  |  |  |  |  |  |
Stock issued during the period performance share award | 548,671 | 635,643 | 982,728 |  |  |  |  |  |
Restricted share awards (RSAs) [Member] |  |  |  |  |  |  |  |  |
Stock issued during period, performance based restricted share awards | 125,026 | 106,275 | 25,989 |  |  |  |  |  |
Performance-Based Restricted Share Awards |  |  |  |  |  |  |  |  |
Stock issued during period, performance based restricted share awards | 978,365 |  |  |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |
Number shares issued pursuant to stock option exercises | 1,146,199 | 2,037,467 | 2,493,684 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Maximum stock authorized to purchase under stock repurchase program |  |  |  |  |  |  | $ 113,000,000 |  |
Stock authorized to purchase under stock repurchase program, shares |  |  |  |  |  |  | 7,500,000 |  |
Remaining value of shares authorized for purchase under the stock repurchase program | $ 138,300,000 |  |  | $ 138,300,000 |  |  |  |  |

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