Components of Equity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 2,010,069	$ 1,748,154
Exercise of stock options	12,920	7,804
Shares repurchased under provisions of stock repurchase plans	(21,865)	(19,584)
Stock compensation expense	10,600	10,472
Tax benefits from stock plans	3,426	2,246
Net earnings	76,722	91,207
Other comprehensive income (loss)	10,162	8,821
Ending Balance	2,102,034	1,849,120
Shareholders' equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2,003,638	1,740,906
Exercise of stock options	12,920	7,804
Shares repurchased under provisions of stock repurchase plans	(21,865)	(19,584)
Stock compensation expense	10,600	10,472
Tax benefits from stock plans	3,426	2,246
Net earnings	76,707	91,232
Other comprehensive income (loss)	10,028	8,833
Ending Balance	2,095,454	1,841,909
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	6,431	7,248
Net earnings	15	(25)
Other comprehensive income (loss)	134	(12)
Ending Balance	$ 6,580	$ 7,211