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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Net Earnings Attributable to Shareholders        
Basic earnings attributable to shareholders $ 160,221 $ 162,692 $ 453,069 $ 438,989
Diluted earnings attributable to shareholders $ 160,221 $ 162,692 $ 453,069 $ 438,989
Weighted Average Shares        
Weighted average basic shares outstanding 170,415 173,394 171,084 174,675
Effect of dilutive potential common shares 3,068 3,779 3,379 3,772
Weighted average diluted shares outstanding 173,483 177,173 174,463 178,447
Earnings Per Share        
Basic earnings attributable to shareholders per share $ 0.94 $ 0.94 $ 2.65 $ 2.51
Diluted earnings attributable to shareholders per share $ 0.92 $ 0.92 $ 2.60 $ 2.46