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Share-based Compensation - Fully Vested Stock Options (Detail) - $ / shares
 12 Months Ended
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.