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REVENUE EARNING EQUIPMENT, NET - Schedule of Revenue Earning Equipment (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Revenue Earning Equipment [Line Items]    
Cost $ 14,539,335 $ 14,765,761
Accumulated Depreciation (6,104,304) (5,988,746)
Net Book Value $ 8,435,031 8,777,015
Trucks    
Revenue Earning Equipment [Line Items]    
Estimated useful life, minimum 3 years  
Estimated useful life, maximum 7 years  
Cost $ 5,151,634 5,061,266
Accumulated Depreciation (1,993,329) (1,818,594)
Net Book Value $ 3,158,305 3,242,672
Tractors    
Revenue Earning Equipment [Line Items]    
Estimated useful life, minimum 4 years  
Estimated useful life, maximum 7 years 6 months  
Cost $ 7,266,726 7,013,595
Accumulated Depreciation (3,032,901) (2,853,591)
Net Book Value $ 4,233,825 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 $ 1,816,896 2,046,768
Accumulated Depreciation (839,048) (804,006)
Net Book Value 977,848 1,242,762
Held for sale    
Revenue Earning Equipment [Line Items]    
Cost 304,079 644,132
Accumulated Depreciation (239,026) (512,555)
Net Book Value $ 65,053 $ 131,577