Operating Information by Segment and Geographic Area - External Revenue and Total Assets by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
TOTAL REVENUE	$ 3,937,707	$ 3,842,235	$ 10,622,201	$ 11,268,305
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
TOTAL REVENUE	1,287,700	1,292,600	3,434,300	4,466,300
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
TOTAL REVENUE	379,800	77,700	880,600	182,100
Asia Pacific (includes Australia)
Revenues from External Customers and Long-Lived Assets [Line Items]
TOTAL REVENUE	489,100	413,500	1,390,900	1,042,100
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
TOTAL REVENUE	839,100	1,268,800	2,400,500	3,544,300
Central and South America
Revenues from External Customers and Long-Lived Assets [Line Items]
TOTAL REVENUE	736,600	464,500	1,841,400	1,038,400
Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
TOTAL REVENUE	$ 205,400	$ 325,100	$ 674,500	$ 995,100