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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net Earnings Attributable to Shareholders        
Basic earnings attributable to shareholders $ 153,149 $ 140,605 $ 292,848 $ 276,297
Diluted earnings attributable to shareholders $ 153,149 $ 140,605 $ 292,848 $ 276,297
Weighted Average Shares        
Weighted average basic shares outstanding 171,003 174,754 171,425 175,324
Effect of dilutive potential common shares 3,463 3,849 3,528 3,796
Weighted average diluted shares outstanding 174,466 178,603 174,953 179,120
Earnings Per Share        
Basic earnings attributable to shareholders per share $ 0.90 $ 0.80 $ 1.71 $ 1.58
Diluted earnings attributable to shareholders per share $ 0.88 $ 0.79 $ 1.67 $ 1.54