REVENUE EARNING EQUIPMENT, NET - Summary of Accelerated and Policy Depreciation, Residual Value Estimate Changes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue Earning Equipment [Abstract]
Accelerated depreciation	$ 12,000	$ 77,000	$ 42,000	$ 156,000
Policy depreciation	63,000	68,000	121,000	119,000
Used vehicle sales, net	$ (51,634)	$ 9,488	$ (80,485)	$ 30,172