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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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net Earnings Attributable to Shareholders
Basic earnings attributable to shareholders	$ 183,869	$ 153,149	$ 306,213	$ 292,848
Diluted earnings attributable to shareholders	$ 183,869	$ 153,149	$ 306,213	$ 292,848
Weighted Average Shares
Weighted average basic shares outstanding	166,767	171,003	167,751	171,425
Effect of dilutive potential common shares	2,523	3,463	2,631	3,528
Weighted average diluted shares outstanding	169,290	174,466	170,382	174,953
Earnings Per Share
Basic earnings attributable to shareholders per share	$ 1.10	$ 0.90	$ 1.83	$ 1.71
Diluted earnings attributable to shareholders per share	$ 1.09	$ 0.88	$ 1.80	$ 1.67

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