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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net Earnings Attributable to Shareholders        
Basic earnings attributable to shareholders $ 162,692 $ 120,263 $ 438,989 $ 322,378
Diluted earnings attributable to shareholders $ 162,692 $ 120,263 $ 438,989 $ 322,378
Weighted Average Shares        
Weighted average basic shares outstanding 173,394 179,416 174,675 179,827
Effect of dilutive potential common shares 3,779 2,372 3,772 2,124
Weighted average diluted shares outstanding 177,173 181,788 178,447 181,951
Earnings Per Share        
Basic earnings attributable to shareholders per share $ 0.94 $ 0.67 $ 2.51 $ 1.79
Diluted earnings attributable to shareholders per share $ 0.92 $ 0.66 $ 2.46 $ 1.77