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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 802,923	$ 724,847	$ 685,866
Weighted average ordinary shares outstanding (in thousands)	162,720	170,155	179,218
Employee stock options, RSUs and PSUs (in thousands)	3,942	3,141	4,401
Diluted weighted average ordinary shares outstanding (in thousands)	166,662	173,296	183,619
Basic earnings per ordinary share	$ 4.93	$ 4.26	$ 3.83
Diluted earnings per ordinary share	$ 4.82	$ 4.18	$ 3.74

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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