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Common Stock and Treasury Stock - Additional Information (Detail) - USD ($) | 9 Months Ended | 57 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | 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 | 3,020,926 | 40,129,393 |  |  |  |  |
Repurchase of common stock, value | $ 60,100,000 | $ 455,900,000 |  |  |  |  |
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 | $ 78,200,000 |  |  |  |  |  |

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