Revenues By Geographic Area (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
Segment Reporting Information [Line Items]
Total consolidated revenues	$ 5,278,176	$ 4,980,201	$ 15,683,947	$ 14,433,157
United States
Segment Reporting Information [Line Items]
Total consolidated revenues	2,885,968	2,674,626	8,376,276	7,552,800
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Total consolidated revenues	1,351,753	1,355,474	4,216,384	4,149,828
Asia Pacific And Japan
Segment Reporting Information [Line Items]
Total consolidated revenues	733,157	695,443	2,192,411	1,944,808
Latin America, Mexico And Canada
Segment Reporting Information [Line Items]
Total consolidated revenues	$ 307,298	$ 254,658	$ 898,876	$ 785,721