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Share-based Compensation - Summary of Stock Option Activity (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Outstanding shares, Beginning Balance 316,000 1,285,536 5,177,582
Outstanding shares, Expired (50,000)    
Outstanding weighted average exercise prices, Expired $ 23.36    
Outstanding shares, Granted 0 100,000 150,000
Outstanding shares, Forfeitures (126,000) (31,164)  
Outstanding shares, Exercised   (945,040) [1] (4,042,046)
Outstanding shares, Repurchased   (93,332)  
Outstanding shares, Ending Balance 140,000 316,000 1,285,536
Outstanding weighted average exercise prices, Beginning Balance $ 19.56 $ 4.77 $ 2.06
Outstanding shares, Exercisable, Ending Balance 33,333    
Outstanding weighted average exercise prices, Granted   24.01 23.36
Outstanding weighted average exercise prices, Forfeitures $ 18.81 1.30  
Outstanding weighted average exercise prices, Exercised   1.96 [1] 1.99
Outstanding weighted average exercise prices, Repurchased   4.83  
Outstanding weighted average exercise prices, Ending Balance 18.88 $ 19.56 $ 4.77
Outstanding weighted average exercise prices, Exercisable, Ending Balance $ 24.01    
[1] At December 31, 2014, the total intrinsic value of options exercised during the year amounted to $19.3 million.