Components of Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 1,847,213	$ 1,694,676
Exercise of stock options	45,365	41,635
Shares repurchased under provisions of stock repurchase plans	(53,908)	(70,292)
Stock compensation expense	10,623	10,831
Tax (deficiency) benefit from stock plans, net		(966)
Net earnings	93,567	97,047
Other comprehensive loss	8,860	9,580
Ending Balance	1,951,720	1,782,511
Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,844,638	1,691,993
Exercise of stock options	45,365	41,635
Shares repurchased under provisions of stock repurchase plans	(53,908)	(70,292)
Stock compensation expense	10,623	10,831
Tax (deficiency) benefit from stock plans, net		(966)
Net earnings	93,264	96,584
Other comprehensive loss	8,914	9,466
Ending Balance	1,948,896	1,779,251
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2,575	2,683
Net earnings	303	463
Other comprehensive loss	(54)	114
Ending Balance	$ 2,824	$ 3,260