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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, 2016
Mar. 31, 2015
Net Earnings Attributable to Shareholders    
Basic earnings attributable to shareholders $ 96,584 $ 106,704
Diluted earnings attributable to shareholders $ 96,584 $ 106,704
Weighted Average Shares    
Weighted average basic shares outstanding 182,010 191,628
Effect of dilutive potential common shares 1,008 1,079
Weighted average diluted shares outstanding 183,018 192,707
Earnings Per Share    
Basic earnings attributable to shareholders per share $ 0.53 $ 0.56
Diluted earnings attributable to shareholders per share $ 0.53 $ 0.55