Components of Equity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 2,010,069	$ 1,748,154
Exercise of stock options			21,610	30,367
Issuance of shares under stock purchase plan			23,391	24,224
Shares repurchased under provisions of stock repurchase plans			(193,493)	(108,572)
Stock compensation expense			32,846	33,446
Tax benefits from stock plans, net			4,000	5,068
Net earnings	88,727	106,876	249,470	293,103
Other Comprehensive Income (loss)	9,632	(24,089)	8,341	(9,896)
Dividends paid			(59,358)	(53,014)
Distributions to noncontrolling interest			(1,177)	(822)
Ending Balance	2,095,699	1,962,058	2,095,699	1,962,058
Shareholders' equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			2,003,638	1,740,906
Exercise of stock options			21,610	30,367
Issuance of shares under stock purchase plan			23,391	24,224
Shares repurchased under provisions of stock repurchase plans			(193,493)	(108,572)
Stock compensation expense			32,846	33,446
Tax benefits from stock plans, net			4,000	5,068
Net earnings			249,152	292,836
Other Comprehensive Income (loss)			8,231	(9,542)
Dividends paid			(59,358)	(53,014)
Ending Balance	2,090,017	1,955,719	2,090,017	1,955,719
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			6,431	7,248
Net earnings			318	267
Other Comprehensive Income (loss)			110	(354)
Distributions to noncontrolling interest			(1,177)	(822)
Ending Balance	$ 5,682	$ 6,339	$ 5,682	$ 6,339