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Stockholder's Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 01, 2014 | Sep. 30, 2014 | Mar. 01, 2014 | Dec. 10, 2012 Board of Directors Maximum
Schedule Of Stockholders Equity [Line Items] |  |  |  |
Common stock repurchase authorized amount |  |  |  | $ 50
Common stock repurchased, shares |  | 1,284,121 |  |
Common stock repurchased, value |  | 30.2 |  |
Remaining authorized shares available for future repurchases |  | 8.2 |  |
Sale of preferred stock |  |  | 2,587,400 |
Convertible preferred stock dividend, rate | 6.25% |  |  |
Conversion rate of preferred stock |  |  | 6,912,756 |
Convertible preferred stock, conversion date | Mar. 01, 2014 |  |  |
Annualized dividend on mandatory convertible preferred stock |  | $ 16.2 |  |

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