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REVENUE EARNING EQUIPMENT, NET - Revenue Earning Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue Earning Equipment [Line Items]    
Cost $ 14,469,122 $ 14,765,761
Accumulated Depreciation (6,146,083) (5,988,746)
Net Book Value $ 8,323,039 8,777,015
Trucks    
Revenue Earning Equipment [Line Items]    
Estimated useful life, minimum 3 years  
Estimated useful life, maximum 7 years  
Cost $ 5,223,127 5,061,266
Accumulated Depreciation (2,055,135) (1,818,594)
Net Book Value $ 3,167,992 3,242,672
Tractors    
Revenue Earning Equipment [Line Items]    
Estimated useful life, minimum 4 years  
Estimated useful life, maximum 7 years 6 months  
Cost $ 7,256,002 7,013,595
Accumulated Depreciation (3,059,206) (2,853,591)
Net Book Value $ 4,196,796 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 $ 1,780,487 2,046,768
Accumulated Depreciation (868,820) (804,006)
Net Book Value 911,667 1,242,762
Held for sale    
Revenue Earning Equipment [Line Items]    
Cost 209,506 644,132
Accumulated Depreciation (162,922) (512,555)
Net Book Value $ 46,584 $ 131,577