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Common and Preferred Stock - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | ---
Nov. 08, 2013 | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Apr. 30, 2013 April Settlement | Apr. 30, 2014 Subsequent Event April Settlement
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Increase in share repurchase authorized amount | $ 300,000,000 |  |  |  |  |
Purchase of common stock (in shares) |  | 551,148 | 700,000.0 |  |  |
Repurchase of common stock, including subsequent settlements |  | 40,100,000 | 35,700,000 |  |  |
Purchase of common stock |  | 37,537,000 | 33,115,000 |  | 2,600,000 | 2,600,000
Remaining authorized repurchase amount |  | $ 327,800,000 |  |  |  |
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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