Components of Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 1,694,676	$ 1,871,608
Exercise of stock options			90,123	60,095
Shares repurchased under provisions of stock repurchase plans			(166,407)	(205,505)
Stock compensation expense			23,788	21,570
Tax deficiency from stock plans, net			(2,444)	1,331
Net earnings	$ 116,439	$ 118,329	213,486	225,661
Other comprehensive income (loss)	(10,297)	4,216	(717)	(15,389)
Dividends paid			(73,000)	(68,781)
Distributions to noncontrolling interest				(857)
Ending Balance	1,779,505	1,889,733	1,779,505	1,889,733
Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			1,691,993	1,868,408
Exercise of stock options			90,123	60,095
Shares repurchased under provisions of stock repurchase plans			(166,407)	(205,505)
Stock compensation expense			23,788	21,570
Tax deficiency from stock plans, net			(2,444)	1,331
Net earnings			212,636	224,464
Other comprehensive income (loss)			(774)	(14,961)
Dividends paid			(73,000)	(68,781)
Ending Balance	1,775,915	1,886,621	1,775,915	1,886,621
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			2,683	3,200
Net earnings			850	1,197
Other comprehensive income (loss)			57	(428)
Distributions to noncontrolling interest				(857)
Ending Balance	$ 3,590	$ 3,112	$ 3,590	$ 3,112