SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Revenue and long-lived assets by geography
Revenue	$ 756,872	$ 714,470	$ 2,298,532	$ 2,035,682
Long-lived assets (excluding goodwill and intangible assets)	290,470		290,470		270,512
United States
Revenue and long-lived assets by geography
Revenue	527,675	499,409	1,594,169	1,417,622
Long-lived assets (excluding goodwill and intangible assets)	268,725		268,725		251,379
All other countries
Revenue and long-lived assets by geography
Revenue	229,197	215,061	704,363	618,060
Long-lived assets (excluding goodwill and intangible assets)	$ 21,745		$ 21,745		$ 19,133