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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 14, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 30, 2012
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares issued |  | 0 | 0 |  |
Preferred stock authorized |  | 5,000,000 | 5,000,000 |  |
Authorized stock repurchase value |  | $ 300,000,000 |  |  | $ 25,000,000
Common stock repurchased and retired, shares |  | 0 |  |  |
Common stock repurchased and retired, per shares value | $ 4.49 | $ 6.70 |  |  |
Common stock repurchased and retired, aggregate value | $ 49,900,000 |  |  |  |
Preferred stock, shares outstanding |  | 0 | 0 |  |
Open Market Transaction [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock repurchased and retired, shares |  |  | 3,400,000 | 13,900,000 |
Common stock repurchased and retired, aggregate value |  |  | $ 23,000,000 | $ 93,100,000 |
Privately Negotiated Transactions [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock repurchased and retired, shares | 11,100,000 |  |  |  |

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