SEGMENTS AND RELATED INFORMATION - SCHEDULE OF REVENUE FROM EXTERNAL CUSTOMERS AND LONG LIVED ASSETS, BY GEOGRAPHICAL AREAS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 8,358,917	$ 8,176,601	$ 7,679,021
Long-Lived Assets	417,282	160,878	156,445
Operating Lease, Right-of-Use Asset	235,834	0		$ 240,000
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	6,234,119	6,089,130	5,775,988
Long-Lived Assets	315,288	106,078	95,851
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,647,066	1,647,933	1,521,378
Long-Lived Assets	95,642	50,877	56,591
Non-US [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	477,732	439,538	381,655
Long-Lived Assets	$ 6,352	$ 3,923	$ 4,003