REVENUE EARNING EQUIPMENT, NET - Fair Value of Revenue Earning Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue Earning Equipment [Line Items]
Total losses	$ 37,070	$ 83,138	$ 53,728
Assets held for sale where fair value was higher	23,000	65,000
Nonrecurring | Level 3
Revenue Earning Equipment [Line Items]
Assets held for sale	108,943	114,574
Total losses	37,070	83,138	53,728
Nonrecurring | Trucks | Level 3
Revenue Earning Equipment [Line Items]
Assets held for sale	40,350	39,009
Total losses	18,022	38,701	40,220
Nonrecurring | Tractors | Level 3
Revenue Earning Equipment [Line Items]
Assets held for sale	64,446	73,359
Total losses	12,139	40,213	9,030
Nonrecurring | Trailers and other | Level 3
Revenue Earning Equipment [Line Items]
Assets held for sale	4,147	2,206
Total losses	$ 6,909	$ 4,224	$ 4,478