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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenues $ 578,549,000 $ 623,414,000 $ 576,899,000 $ 520,687,000 $ 537,042,000 $ 577,546,000 $ 510,543,000 $ 440,867,000 $ 2,299,549,000 $ 2,065,999,000 $ 1,907,609,000
Operating expenses 565,047,000 602,912,000 568,482,000 544,037,000 548,058,000 565,313,000 503,342,000 463,854,000 2,280,479,000 2,080,567,000 1,897,850,000
OPERATING INCOME (LOSS) 13,502,000 20,502,000 8,417,000 (23,350,000) (11,016,000) 12,233,000 7,201,000 (22,987,000) 19,070,000 (14,568,000) 9,759,000
Other income (expense), net 393,000 502,000 (552,000) 47,000 (1,300,000) (457,000) (1,117,000) 451,000 391,000 (2,424,000) (266,000)
Income tax provision (benefit) 3,549,000 7,022,000 2,987,000 (9,908,000) (4,387,000) 5,258,000 (5,757,000) (4,374,000) 3,650,000 (9,260,000) 3,160,000
Net income (loss) attributable to Arkansas Best Corporation 10,346,000 13,982,000 4,878,000 (13,395,000) (7,929,000) 6,518,000 11,841,000 (18,162,000) 15,811,000 (7,732,000) 6,159,000
Earnings (loss) per common share                      
Basic (in dollars per share) $ 0.38 $ 0.52 $ 0.18 $ (0.52) $ (0.31) $ 0.24 $ 0.44 $ (0.71) $ 0.59 [1] $ (0.31) [1] $ 0.23 [1]
Diluted (in dollars per share) $ 0.38 $ 0.52 $ 0.18 $ (0.52) $ (0.31) $ 0.24 $ 0.44 $ (0.71) $ 0.59 [1] $ (0.31) [1] $ 0.23 [1]
Average common shares outstanding                      
Basic (in shares) 25,785,485 25,736,810 25,694,327 25,638,333 25,629,309 25,613,315 25,544,455 25,455,607 25,714,205 25,564,752 25,403,073
Diluted (in shares) 25,793,366 25,736,810 25,694,327 25,638,333 25,629,309 25,613,315 25,544,455 25,455,607 25,714,205 25,564,752 25,403,073
After-tax adjustment to correct the reserves for workers' compensation and third-party casualty claims         $ 2,700,000            
[1] The Company uses the two‑class method for calculating earnings per share. See Note M.