Components of Equity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 2,010,069	$ 1,748,154
Exercise of stock options			20,402	23,625
Shares repurchased under provisions of stock repurchase plans			(106,266)	(65,274)
Stock compensation expense			21,526	20,708
Tax benefits from stock plans			4,232	4,531
Net earnings	84,021	95,020	160,743	186,227
Other comprehensive income (loss)	(11,453)	5,372	(1,291)	14,193
Dividends paid			(59,358)	(53,014)
Ending Balance	2,050,057	1,879,150	2,050,057	1,879,150
Shareholders' equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			2,003,638	1,740,906
Exercise of stock options			20,402	23,625
Shares repurchased under provisions of stock repurchase plans			(106,266)	(65,274)
Stock compensation expense			21,526	20,708
Tax benefits from stock plans			4,232	4,531
Net earnings			160,662	186,232
Other comprehensive income (loss)			(1,381)	14,334
Dividends paid			(59,358)	(53,014)
Ending Balance	2,043,455	1,872,048	2,043,455	1,872,048
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			6,431	7,248
Net earnings			81	(5)
Other comprehensive income (loss)			90	(141)
Ending Balance	$ 6,602	$ 7,102	$ 6,602	$ 7,102