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Share-based Compensation - Fully Vested Stock Options (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Vested stock options, Shares | [1],[2],[3] | 33,333 | 766,995 | 3,757,099
Vested stock options, Weighted average exercise price | [1],[2],[3] | $ 24.01 | $ 3.75 | $ 2.07
[1] | At December 31, 2015, there is no intrinsic value for vested stock options as the options are out-of-the-money. For December 31, 2014 and 2013, the aggregate intrinsic value amounted to $14.0 million and $84.9 million, respectively.
[2] | The fair value of vested stock options at December 31, 2015, 2014 and 2013 amounted to $1.4 million, $17.0 million and $92.7 million, respectively.
[3] | The weighted average contractual term of fully vested options is 8.16 years, 6.06 years and 7.04 years as of December 31, 2015, 2014 and 2013, respectively.

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- References No definition available. + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options vested. + References No definition available. + Details
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