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Share-Based Payments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
General vesting period   3 years  
Total unrecognized compensation cost related to unvested share-based payments $ 100,300 $ 100,300  
Weighted average period for unrecognized compensation cost expected to be recognized (in years)   2 years 2 months 5 days  
Proceeds from exercise of stock options   $ 28,531 $ 10,458
Stock Options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option expire from date of grant, period   10 years  
Performance Cycle 2016-2018 | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period for evaluation of EPS target   3 years  
Period for evaluation of TSR   3 years  
Share-based compensation 1,700 $ 1,700  
Performance Cycle 2016-2018 | Performance Shares Market Related Component [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation $ 200 $ 200