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Computation of Basic and Diluted Earnings per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]      
Net income $ 724,847 $ 685,866 $ 659,571
Weighted average ordinary shares outstanding (in thousands) 170,155 179,218 188,487
Employee stock options, RSUs and PSUs (in thousands) 3,141 4,401 3,813
Diluted weighted average ordinary shares outstanding (in thousands) 173,296 183,619 192,300
Basic earnings per ordinary share $ 4.26 $ 3.83 $ 3.50
Diluted earnings per ordinary share $ 4.18 $ 3.74 $ 3.43