Components of Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 1,871,608	$ 2,086,331
Exercise of stock options			88,851	34,669
Issuance of shares under stock purchase plan			25,850	23,800
Shares repurchased under provisions of stock repurchase plans			(415,475)	(475,160)
Stock compensation expense			32,489	32,220
Tax benefits from stock plans, net			1,191	1,031
Net earnings	$ 118,736	$ 102,797	344,397	278,720
Other comprehensive loss	(21,692)	(18,351)	(37,081)	(15,632)
Dividends paid			(68,781)	(62,807)
Purchase of noncontrolling interest				843
Distributions to noncontrolling interest			(857)	(85)
Ending Balance	1,842,192	1,903,930	1,842,192	1,903,930
Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			1,868,408	2,084,783
Exercise of stock options			88,851	34,669
Issuance of shares under stock purchase plan			25,850	23,800
Shares repurchased under provisions of stock repurchase plans			(415,475)	(475,160)
Stock compensation expense			32,489	32,220
Tax benefits from stock plans, net			1,191	1,031
Net earnings			342,774	277,507
Other comprehensive loss			(36,262)	(15,513)
Dividends paid			(68,781)	(62,807)
Purchase of noncontrolling interest				843
Ending Balance	1,839,045	1,901,373	1,839,045	1,901,373
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			3,200	1,548
Net earnings			1,623	1,213
Other comprehensive loss			(819)	(119)
Distributions to noncontrolling interest			(857)	(85)
Ending Balance	$ 3,147	$ 2,557	$ 3,147	$ 2,557