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Computation of Basic and Diluted Earnings per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share [Line Items]      
Net income $ 620,000 $ 543,966 $ 452,826
Weighted average ordinary shares outstanding (in thousands) 203,918 206,917 208,106
Employee stock options and RSUs (in thousands) 5,252 7,005 4,827
Diluted weighted average ordinary shares outstanding (in thousands) 209,170 213,922 212,933
Basic earnings per ordinary share $ 3.04 $ 2.63 $ 2.18
Diluted earnings per ordinary share $ 2.96 $ 2.54 $ 2.13