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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, 2018
Mar. 31, 2017
Net Earnings Attributable to Shareholders    
Basic earnings attributable to shareholders $ 135,692 $ 93,264
Diluted earnings attributable to shareholders $ 135,692 $ 93,264
Weighted Average Shares    
Weighted average basic shares outstanding 175,900 180,062
Effect of dilutive potential common shares 3,516 2,032
Weighted average diluted shares outstanding 179,416 182,094
Earnings Per Share    
Basic earnings attributable to shareholders per share $ 0.77 $ 0.52
Diluted earnings attributable to shareholders per share $ 0.76 $ 0.51