OPERATING SEGMENT DATA - Operating Expenses by Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
OPERATING EXPENSES
Salaries, wages, and benefits	$ 451,824	$ 397,116	$ 1,321,871	$ 1,145,657
Rents, purchased transportation, and other costs of services	596,631	382,759	1,854,387	1,039,857
Fuel, supplies, and expenses	112,834	82,051	331,759	235,221
Depreciation and amortization	34,707	30,359	104,860	90,995
Other	40,074	36,811	118,922	89,062
Total consolidated operating expenses	$ 1,236,070	$ 929,096	3,731,799	2,600,792
Gain on sale of subsidiaries			402	6,923
Gain on sale of property and equipment			$ 9,759	8,389
ArcBest
OPERATING EXPENSES
Gain on sale of subsidiaries				$ 6,900