Components of Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 1,871,608	$ 2,086,331
Exercise of stock options			60,095	30,017
Shares repurchased under provisions of stock repurchase plans			(205,505)	(358,116)
Stock compensation expense			21,570	22,171
Tax benefits from stock plans, net			1,331	984
Net earnings	$ 118,329	$ 91,728	225,661	175,923
Other comprehensive (loss) income	4,216	5,096	(15,389)	2,719
Dividends paid			(68,781)	(62,807)
Distributions to noncontrolling interest			(857)	(85)
Ending Balance	1,889,733	1,897,137	1,889,733	1,897,137
Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			1,868,408	2,084,783
Exercise of stock options			60,095	30,017
Shares repurchased under provisions of stock repurchase plans			(205,505)	(358,116)
Stock compensation expense			21,570	22,171
Tax benefits from stock plans, net			1,331	984
Net earnings			224,464	175,126
Other comprehensive (loss) income			(14,961)	2,656
Dividends paid			(68,781)	(62,807)
Ending Balance	1,886,621	1,894,814	1,886,621	1,894,814
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			3,200	1,548
Net earnings			1,197	797
Other comprehensive (loss) income			(428)	63
Distributions to noncontrolling interest			(857)	(85)
Ending Balance	$ 3,112	$ 2,323	$ 3,112	$ 2,323