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Earnings Per Share - Additional Information (Detail) - shares
shares in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Stock options and restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (shares) 3,684 3,358
5.50% Convertible Senior Notes due 2021    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (shares) 12,593  
Convertible senior notes interest rate 5.50%