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Basic and Diluted Earnings per Share - Numerator and Denominator of the Basic and Diluted Per Share Computations for Earnings Attributable to Shareholders Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net Earnings Attributable to Shareholders        
Basic earnings attributable to shareholders $ 120,263 $ 107,581 $ 322,378 $ 320,217
Diluted earnings attributable to shareholders $ 120,263 $ 107,581 $ 322,378 $ 320,217
Weighted Average Shares        
Weighted average basic shares outstanding 179,416 181,177 179,827 181,645
Effect of dilutive potential common shares 2,372 1,515 2,124 1,313
Weighted average diluted shares outstanding 181,788 182,692 181,951 182,958
Earnings Per Share        
Basic earnings attributable to shareholders per share $ 0.67 $ 0.59 $ 1.79 $ 1.76
Diluted earnings attributable to shareholders per share $ 0.66 $ 0.59 $ 1.77 $ 1.75