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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net Earnings Attributable to Shareholders        
Basic earnings attributable to shareholders $ 140,605 $ 108,851 $ 276,297 $ 202,115
Diluted earnings attributable to shareholders $ 140,605 $ 108,851 $ 276,297 $ 202,115
Weighted Average Shares        
Weighted average basic shares outstanding 174,754 180,012 175,324 180,037
Effect of dilutive potential common shares 3,849 2,021 3,796 2,054
Weighted average diluted shares outstanding 178,603 182,033 179,120 182,091
Earnings Per Share        
Basic earnings attributable to shareholders per share $ 0.80 $ 0.60 $ 1.58 $ 1.12
Diluted earnings attributable to shareholders per share $ 0.79 $ 0.60 $ 1.54 $ 1.11