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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net Earnings Attributable to Shareholders        
Basic earnings attributable to shareholders $ 116,052 $ 117,760 $ 212,636 $ 224,464
Diluted earnings attributable to shareholders $ 116,052 $ 117,760 $ 212,636 $ 224,464
Weighted Average Shares        
Weighted average basic shares outstanding 181,753 190,679 181,882 191,151
Effect of dilutive potential common shares 1,379 1,239 1,228 1,275
Weighted average diluted shares outstanding 183,132 191,918 183,110 192,426
Earnings Per Share        
Basic earnings attributable to shareholders per share $ 0.64 $ 0.62 $ 1.17 $ 1.17
Diluted earnings attributable to shareholders per share $ 0.63 $ 0.61 $ 1.16 $ 1.17