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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]      
Net income $ 685,866 $ 659,571 $ 652,800
Weighted average ordinary shares outstanding (in thousands) 179,218 188,487 195,647
Employee stock options, RSUs and PSUs (in thousands) 4,401 3,813 3,840
Diluted weighted average ordinary shares outstanding (in thousands) 183,619 192,300 199,487
Basic earnings per ordinary share $ 3.83 $ 3.50 $ 3.34
Diluted earnings per ordinary share $ 3.74 $ 3.43 $ 3.27