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Common and Preferred Stock (Additional Information) (Detail) (USD $) | 0 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 08, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Oct. 27, 2014 Subsequent Event | Sep. 30, 2014 October Settlement
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Increase in share repurchase authorized amount | $ 300,000,000 |  |  |  |  |
Purchase of common stock (in shares) |  | 1,984,337 | 2,500,000.0 |  |  |
Repurchase of common stock, including subsequent settlements |  | 149,700,000 | 139,900,000 |  |  |
Purchase of common stock |  | 146,042,000 | 137,272,000 |  | 2,700,000 | 3,700,000
Remaining authorized repurchase amount |  | $ 218,200,000 |  |  |  |
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 |  |

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