SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) renewal_option segment
Disaggregation of Revenue [Line Items]
Number of segments | segment		3
Special recognition and retention bonus for front-line employees | $	$ 28,000,000
Maintenance term contract		1 year
Cancellable contract term		1 year
Maximum amount of insurance risk of loss retained per occurrence | $		$ 3,000,000
Trailers and other
Disaggregation of Revenue [Line Items]
Term of operating lease as lessor	10 years	10 years
Facilities
Disaggregation of Revenue [Line Items]
Lease renewal term	5 years	5 years
Revenue Earning Equipment, Material Handling Equipment, Automated Washing Machines and Vehicles
Disaggregation of Revenue [Line Items]
Number of renewal options | renewal_option		0
Minimum | ChoiceLease Service Contracts
Disaggregation of Revenue [Line Items]
Contract term	3 years	3 years
Minimum | SCS And DTS Service Contracts
Disaggregation of Revenue [Line Items]
Contract term	3 years	3 years
Minimum | Trucks and Tractors
Disaggregation of Revenue [Line Items]
Term of operating lease as lessor	3 years	3 years
Minimum | Revenue Earning Equipment
Disaggregation of Revenue [Line Items]
Term of operating lease as lessor	1 day	1 day
Minimum | Facilities
Disaggregation of Revenue [Line Items]
Term of operating lease as lessee	3 years	3 years
Number of renewal options | renewal_option		1
Minimum | Revenue Earning Equipment, Material Handling Equipment, Automated Washing Machines and Vehicles
Disaggregation of Revenue [Line Items]
Term of operating lease as lessee	3 years	3 years
Maximum | ChoiceLease Service Contracts
Disaggregation of Revenue [Line Items]
Contract term	7 years	7 years
Maximum | SCS And DTS Service Contracts
Disaggregation of Revenue [Line Items]
Contract term	5 years	5 years
Maximum | Trucks and Tractors
Disaggregation of Revenue [Line Items]
Term of operating lease as lessor	7 years	7 years
Maximum | Revenue Earning Equipment
Disaggregation of Revenue [Line Items]
Term of operating lease as lessor	1 year	1 year
Maximum | Facilities
Disaggregation of Revenue [Line Items]
Term of operating lease as lessee	5 years	5 years
Maximum | Revenue Earning Equipment, Material Handling Equipment, Automated Washing Machines and Vehicles
Disaggregation of Revenue [Line Items]
Term of operating lease as lessee	7 years	7 years