Components of Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 1,694,676	$ 1,871,608
Exercise of stock options	41,635	35,048
Shares repurchased under provisions of stock repurchase plans	(70,292)	(77,368)
Stock compensation expense	10,831	9,907
Tax benefits from stock plans, net	(966)	1,466
Net earnings	97,047	107,332
Other comprehensive income (loss)	9,580	(19,605)
Distributions to noncontrolling interest		(857)
Ending Balance	1,782,511	1,927,531
Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,691,993	1,868,408
Exercise of stock options	41,635	35,048
Shares repurchased under provisions of stock repurchase plans	(70,292)	(77,368)
Stock compensation expense	10,831	9,907
Tax benefits from stock plans, net	(966)	1,466
Net earnings	96,584	106,704
Other comprehensive income (loss)	9,466	(19,274)
Ending Balance	1,779,251	1,924,891
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2,683	3,200
Net earnings	463	628
Other comprehensive income (loss)	114	(331)
Distributions to noncontrolling interest		(857)
Ending Balance	$ 3,260	$ 2,640