SEGMENT REPORTING - Segment Reporting Information by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information
Operating revenue	$ 710,387	$ 551,138
Operating income	37,319	12,858
Depreciation and amortization	35,865	41,359
Trucking
Segment Reporting Information
Operating revenue	440,346	381,589
USAT Logistics
Segment Reporting Information
Operating revenue	270,041	169,549
Operating Segments
Segment Reporting Information
Operating income	37,319	12,858
Depreciation and amortization	35,865	41,359
Operating Segments | Trucking
Segment Reporting Information
Operating revenue	441,116	384,256
Operating income	22,609	9,297
Depreciation and amortization	34,777	40,203
Operating Segments | USAT Logistics
Segment Reporting Information
Operating revenue	323,356	191,951
Operating income	14,710	3,561
Depreciation and amortization	1,088	1,156
Intersegment Eliminations
Segment Reporting Information
Operating revenue	(54,085)	(25,069)
Intersegment Eliminations | Trucking
Segment Reporting Information
Operating revenue	(770)	(2,667)
Intersegment Eliminations | USAT Logistics
Segment Reporting Information
Operating revenue	(53,315)	(22,402)
Foreign Countries | Operating Segments | Trucking
Segment Reporting Information
Operating revenue	$ 37,900	$ 33,600