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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Earnings Attributable to Shareholders
Basic earnings attributable to shareholders	$ 359,068	$ 191,307	$ 962,660	$ 497,520
Diluted earnings attributable to shareholders	$ 359,068	$ 191,307	$ 962,660	$ 497,520
Weighted Average Shares
Weighted average basic shares outstanding	169,633	168,310	169,398	167,942
Effect of dilutive potential common shares	1,932	2,425	2,151	2,597
Weighted average diluted shares outstanding	171,565	170,735	171,549	170,539
Earnings Per Share
Basic earnings attributable to shareholders per share	$ 2.12	$ 1.14	$ 5.68	$ 2.96
Diluted earnings attributable to shareholders per share	$ 2.09	$ 1.12	$ 5.61	$ 2.92