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SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue and long-lived assets by geography
Revenue	$ 830,754us-gaap_Revenues	$ 782,231us-gaap_Revenues	$ 756,315us-gaap_Revenues	$ 740,247us-gaap_Revenues	$ 724,455us-gaap_Revenues	$ 756,872us-gaap_Revenues	$ 799,411us-gaap_Revenues	$ 742,249us-gaap_Revenues	$ 3,109,547us-gaap_Revenues	$ 3,022,987us-gaap_Revenues	$ 2,800,933us-gaap_Revenues
Long-lived assets (excluding goodwill and intangible assets)	302,459us-gaap_PropertyPlantAndEquipmentNet				293,964us-gaap_PropertyPlantAndEquipmentNet				302,459us-gaap_PropertyPlantAndEquipmentNet	293,964us-gaap_PropertyPlantAndEquipmentNet
United States
Revenue and long-lived assets by geography
Revenue									2,146,189	2,081,485	1,966,383
Long-lived assets (excluding goodwill and intangible assets)	281,879				271,916				281,879	271,916
All other countries
Revenue and long-lived assets by geography
Revenue									963,358	941,502	834,550
Long-lived assets (excluding goodwill and intangible assets)	$ 20,580				$ 22,048				$ 20,580	$ 22,048