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Stockholder's Equity - Additional Information (Detail) - $ / shares |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 01, 2014 | Dec. 31, 2015 | Dec. 31, 2014
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 |  | 6,000,000 |
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. 03, 2014 |

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