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OPERATING SEGMENT DATA - (Rev and Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
REVENUES                      
Revenues $ 710,721 $ 744,280 $ 720,368 $ 651,088 $ 688,214 $ 713,923 $ 676,627 $ 621,455 $ 2,826,457 $ 2,700,219 $ 2,666,905
OPERATING EXPENSES                      
Salaries, wages, and benefits                 1,367,433 1,345,672 1,297,129
Fuel, supplies, and expenses                 304,126 270,138 292,039
Depreciation and amortization                 103,068 103,053 93,042
Gain on sale of property and equipment                 (227) (3,335) (2,225)
Other                 125,773 118,390 118,587
Restructuring costs         10,300       2,963 10,313  
Total consolidated operating expenses 694,041 719,931 695,634 663,341 687,003 693,553 659,973 630,720 2,772,947 2,671,249 2,591,409
OPERATING INCOME                      
OPERATING INCOME (LOSS) 16,680 24,349 24,734 (12,253) 1,211 20,370 16,654 (9,265) 53,510 28,970 75,496
OTHER INCOME (COSTS)                      
Interest and dividend income                 1,293 1,523 1,284
Interest and other related financing costs                 (6,342) (5,150) (4,400)
Other, net                 3,115 2,944 354
TOTAL OTHER INCOME (COSTS) $ (660) $ (281) $ (599) $ (394) $ (115) $ 185 $ (273) $ (480) (1,934) (683) (2,762)
INCOME BEFORE INCOME TAXES                 51,576 28,287 72,734
Operating Segments | Asset-Based                      
REVENUES                      
Revenues                 1,993,314 1,916,394 1,916,579
OPERATING EXPENSES                      
Salaries, wages, and benefits                 1,125,186 1,103,883 1,063,016
Fuel, supplies, and expenses                 234,006 216,263 244,772
Operating taxes and licenses                 47,767 48,180 48,726
Insurance                 30,761 29,178 28,591
Communications and utilities                 17,373 16,181 14,158
Depreciation and amortization                 82,507 80,331 71,320
Rents and purchased transportation                 206,457 198,594 196,560
Shared services                 186,406 184,817 180,478
Gain on sale of property and equipment                 (695) (2,979) (1,734)
Other                 6,525 4,889 6,424
Restructuring costs                 344 1,173  
Total consolidated operating expenses                 1,941,436 1,882,823 1,854,143
OPERATING INCOME                      
OPERATING INCOME (LOSS)                 51,878 33,571 62,436
Operating Segments | ArcBest                      
REVENUES                      
Revenues                 706,698 640,734 590,436
OPERATING EXPENSES                      
Purchased transportation                 563,497 502,159 460,172
Supplies and expenses                 15,087 13,145 11,689
Depreciation and amortization                 13,090 13,612 12,886
Shared services                 84,159 85,238 73,890
Other                 11,189 11,678 11,007
Restructuring costs                 875 8,038  
Total consolidated operating expenses                 687,897 633,870 569,644
OPERATING INCOME                      
OPERATING INCOME (LOSS)                 18,801 6,864 20,792
Operating Segments | FleetNet                      
REVENUES                      
Revenues                 156,341 162,629 174,952
OPERATING EXPENSES                      
Depreciation and amortization                 1,089 1,210 1,119
Total consolidated operating expenses                 153,017 160,204 171,998
OPERATING INCOME                      
OPERATING INCOME (LOSS)                 3,324 2,425 2,954
Other and eliminations                      
REVENUES                      
Revenues                 (29,896) (19,538) (15,062)
OPERATING EXPENSES                      
Depreciation and amortization                 6,382 7,900 7,717
Total consolidated operating expenses                 (9,403) (5,648) (4,376)
OPERATING INCOME                      
OPERATING INCOME (LOSS)                 (20,493) (13,890) (10,686)
Nonunion Defined Benefit Pension Plan                      
OPERATING EXPENSES                      
Nonunion pension expense, including settlement                 6,090 3,075 2,440
Nonunion Defined Benefit Pension Plan | Operating Segments | Asset-Based                      
OPERATING EXPENSES                      
Nonunion pension expense, including settlement                 $ 4,799 $ 2,313 $ 1,832