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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
Mar. 31, 2019
Mar. 31, 2018
Net Earnings Attributable to Shareholders    
Basic earnings attributable to shareholders $ 139,699 $ 135,692
Diluted earnings attributable to shareholders $ 139,699 $ 135,692
Weighted Average Shares    
Weighted average basic shares outstanding 171,818 175,900
Effect of dilutive potential common shares 3,570 3,516
Weighted average diluted shares outstanding 175,388 179,416
Earnings Per Share    
Basic earnings attributable to shareholders per share $ 0.81 $ 0.77
Diluted earnings attributable to shareholders per share $ 0.80 $ 0.76