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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net Earnings Attributable to Shareholders        
Basic earnings attributable to shareholders $ 107,581 $ 118,310 $ 320,217 $ 342,774
Diluted earnings attributable to shareholders $ 107,581 $ 118,310 $ 320,217 $ 342,774
Weighted Average Shares        
Weighted average basic shares outstanding 181,177 188,424 181,645 190,232
Effect of dilutive potential common shares 1,515 1,218 1,313 1,216
Weighted average diluted shares outstanding 182,692 189,642 182,958 191,448
Earnings Per Share        
Basic earnings attributable to shareholders per share $ 0.59 $ 0.63 $ 1.76 $ 1.80
Diluted earnings attributable to shareholders per share $ 0.59 $ 0.62 $ 1.75 $ 1.79