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Stockholder's Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 28, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 10, 2012 Board of Directors | Feb. 28, 2011 Minimum | Feb. 28, 2011 Maximum
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  | 100,000,000 | 100,000,000 |  |  |
Common stock, par value |  | $ 0.01 | $ 0.01 |  |  |
Preferred stock, shares authorized |  | 40,000,000 |  |  |  |
Preferred stock, par value |  | $ 1 |  |  |  |
Unissued common stock reserved for stock - based incentive plans and convertible preferred stock issuance |  | 19,100,000 |  |  |  |
Sale of preferred stock | 2,587,500 | 2,600,000 | 2,600,000 |  |  |
Convertible preferred stock dividend, rate | 6.25% | 6.25% |  |  |  |
Net proceeds from issuance of 6.25% mandatory convertible preferred stock | $ 249.7 |  |  |  |  |
Conversion rate of preferred stock |  |  |  |  | 2.1899 | 2.6717
Trading days | 20 days |  |  |  |  |
Convertible preferred stock, conversion date | Mar. 01, 2014 |  |  |  |  |
Initial liquidation preference per share |  | $ 100 |  |  |  |
Preferred stock dividend per year per share |  | $ 6.25 |  |  |  |
Annualized dividend on mandatory convertible preferred stock |  | 16.2 |  |  |  |
Common stock repurchase authorized amount |  |  |  | 50 |  |
Common stock repurchased, shares |  | 600,000 |  |  |  |
Common stock repurchased, value |  | 11.7 |  |  |  |
Remaining authorized shares available for future repurchases |  | $ 38.3 |  |  |  |

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