REVENUE EARNING EQUIPMENT, NET - Summary of Accelerated and Policy Depreciation, Residual Value Estimate Changes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Accelerated depreciation	$ 236,000	$ 223,000	$ 39,000
Policy depreciation	255,000	134,000	40,000
Used vehicle sales, net	$ (414)	$ 58,706	$ 22,325