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Common and Preferred Stock - Additional Information (Detail) (USD $) | 0 Months Ended | 9 Months Ended |  | 9 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 22, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Repurchase Of Common Stock | Sep. 30, 2012 Repurchase Of Common Stock | Oct. 30, 2013 Subsequent Event April Settlement
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Increase in share repurchase authorized amount | $ 200,000,000 |  |  |  |  |  |
Purchase of common stock (in shares) |  | 2,510,306 |  |  | 2,510,406 | 1,900,000.0 |
Purchase of common stock |  | $ 137,272,000 | $ 75,174,000 |  | $ 139,900,000 | $ 75,200,000 | $ 2,700,000
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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