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Common and Preferred Stock (Additional Information) (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Nov. 06, 2014 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Stockholders Equity Note [Line Items] |  |  |  |
Increase in share repurchase authorized amount | $ 300,000 |  |  |
Purchase of common stock (in shares) |  | 628,493 | 829,744 |
Repurchase of common stock, including subsequent settlements |  | $ 45,800 | $ 62,100 |
Purchase of common stock |  | 46,864 | 62,132 |
Remaining authorized repurchase amount |  | $ 589,200 |  |
Common stock, authorized (in shares) |  | 150,000,000 |  | 150,000,000
Common stock, par value (in dollars per share) |  | $ 0.01 |  | $ 0.01
Preferred stock, authorized (in shares) |  | 5,000,000 |  | 5,000,000
Preferred stock, par value (in dollars per share) |  | $ 0.01 |  | $ 0.01
Preferred stock, issued (in shares) |  | 0 |  | 0
October Settlement |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Purchase of common stock |  | $ 1,200 | $ 2,700 |

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