REVENUE EARNING EQUIPMENT, NET - Schedule of Revenue Earning Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Revenue Earning Equipment [Line Items]
Cost	$ 14,578,331	$ 14,765,761
Accumulated Depreciation	(6,047,232)	(5,988,746)
Net Book Value	$ 8,531,099	8,777,015
Trucks
Revenue Earning Equipment [Line Items]
Estimated useful life, minimum	3 years
Estimated useful life, maximum	7 years
Cost	$ 5,195,420	5,061,266
Accumulated Depreciation	(1,945,096)	(1,818,594)
Net Book Value	$ 3,250,324	3,242,672
Tractors
Revenue Earning Equipment [Line Items]
Estimated useful life, minimum	4 years
Estimated useful life, maximum	7 years 6 months
Cost	$ 7,247,325	7,013,595
Accumulated Depreciation	(3,040,912)	(2,853,591)
Net Book Value	$ 4,206,413	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	$ 1,765,247	2,046,768
Accumulated Depreciation	(768,590)	(804,006)
Net Book Value	996,657	1,242,762
Held for sale
Revenue Earning Equipment [Line Items]
Cost	370,339	644,132
Accumulated Depreciation	(292,634)	(512,555)
Net Book Value	$ 77,705	$ 131,577