LEASES AND RIGHT OF USE ASSETS - Revenue Equipment (Details)	9 Months Ended
	Sep. 30, 2019 item
Lease details
Number of leased tractors	1,112
Number of leased trailers	808
Equipment finance leases
Lease details
Number of leased tractors	764
Number of leased trailers	759
Equipment operating leases
Lease details
Number of leased tractors	348
Number of leased trailers	49