SEGMENT INFORMATION - Schedule of Geographic Information About Revenue and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenue and long-lived assets by geography
Revenue	$ 1,059,122	$ 767,387	$ 2,054,197	$ 1,528,220
Property and equipment, net of accumulated depreciation and amortization	306,602		306,602		$ 315,170
United States
Revenue and long-lived assets by geography
Revenue	708,571	545,020	1,366,151	1,093,618
Property and equipment, net of accumulated depreciation and amortization	277,566		277,566		286,541
All other countries
Revenue and long-lived assets by geography
Revenue	350,551	$ 222,367	688,046	$ 434,602
Property and equipment, net of accumulated depreciation and amortization	$ 29,036		$ 29,036		$ 28,629