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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, 2017
Mar. 31, 2016
Net Earnings Attributable to Shareholders    
Basic earnings attributable to shareholders $ 93,264 $ 96,584
Diluted earnings attributable to shareholders $ 93,264 $ 96,584
Weighted Average Shares    
Weighted average basic shares outstanding 180,062 182,010
Effect of dilutive potential common shares 2,032 1,008
Weighted average diluted shares outstanding 182,094 183,018
Earnings Per Share    
Basic earnings attributable to shareholders per share $ 0.52 $ 0.53
Diluted earnings attributable to shareholders per share $ 0.51 $ 0.53