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OPERATING SEGMENT DATA - (Operating Expenses) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING EXPENSES                        
Salaries, wages, and benefits                   $ 1,398,348 $ 1,361,224 $ 1,340,577
Rents, purchased transportation, and other costs of services                   989,006 869,584 823,683
Fuel, supplies, and expenses                   325,126 304,126 270,138
Depreciation and amortization                   108,635 103,068 103,053
Other                   123,998 124,144 118,390
Multiemployer pension fund withdrawal liability charge       $ 37,900           37,922    
Restructuring costs                   1,655 2,963 10,313
Total consolidated operating expenses   $ 737,117 $ 770,103 $ 790,194 $ 687,276 $ 691,982 $ 717,538 $ 694,601 $ 660,988 $ 2,984,690 $ 2,765,109 $ 2,666,154
Asset-Based | Multiemployer pension plans | New England Pension Fund                        
OPERATING EXPENSES                        
Multiemployer pension fund withdrawal liability charge $ 37,900