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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net Earnings Attributable to Shareholders        
Basic earnings attributable to shareholders $ 108,851 $ 116,052 $ 202,115 $ 212,636
Diluted earnings attributable to shareholders $ 108,851 $ 116,052 $ 202,115 $ 212,636
Weighted Average Shares        
Weighted average basic shares outstanding 180,012 181,753 180,037 181,882
Effect of dilutive potential common shares 2,021 1,379 2,054 1,228
Weighted average diluted shares outstanding 182,033 183,132 182,091 183,110
Earnings Per Share        
Basic earnings attributable to shareholders per share $ 0.60 $ 0.64 $ 1.12 $ 1.17
Diluted earnings attributable to shareholders per share $ 0.60 $ 0.63 $ 1.11 $ 1.16