REVENUE EARNING EQUIPMENT, NET - Schedule of Revenue Earning Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Revenue Earning Equipment [Line Items]
Cost	$ 14,571,853	$ 14,765,761
Accumulated Depreciation	(6,004,466)	(5,988,746)
Net Book Value	$ 8,567,387	8,777,015
Trucks
Revenue Earning Equipment [Line Items]
Estimated useful life, minimum	3 years
Estimated useful life, maximum	7 years
Cost	$ 5,030,474	5,061,266
Accumulated Depreciation	(1,850,029)	(1,818,594)
Net Book Value	$ 3,180,445	3,242,672
Tractors
Revenue Earning Equipment [Line Items]
Estimated useful life, minimum	4 years
Estimated useful life, maximum	7 years 6 months
Cost	$ 7,020,010	7,013,595
Accumulated Depreciation	(2,919,190)	(2,853,591)
Net Book Value	$ 4,100,820	4,160,004
Trailers and other
Revenue Earning Equipment [Line Items]
Estimated useful life, minimum	9 years 6 months
Estimated useful life, maximum	12 years
Cost	$ 2,006,980	2,046,768
Accumulated Depreciation	(829,791)	(804,006)
Net Book Value	1,177,189	1,242,762
Held for sale
Revenue Earning Equipment [Line Items]
Cost	514,389	644,132
Accumulated Depreciation	(405,456)	(512,555)
Net Book Value	$ 108,933	$ 131,577