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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 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
Basic earnings (loss) per share, numerator:                      
Net income (loss) attributable to Arkansas Best Corporation $ 10,346 $ 13,982 $ 4,878 $ (13,395) $ (7,929) $ 6,518 $ 11,841 $ (18,162) $ 15,811 $ (7,732) $ 6,159
Effect of unvested restricted stock awards                 (720) (149) (249)
Adjusted net income (loss)                 15,091 (7,881) 5,910
Basic earnings (loss) per share, denominator:                      
Weighted-average 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
Earnings (loss) per common share (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 earnings (loss) per share, numerator:                      
Net income (loss) attributable to Arkansas Best Corporation 10,346 13,982 4,878 (13,395) (7,929) 6,518 11,841 (18,162) 15,811 (7,732) 6,159
Effect of unvested restricted stock awards                 (720) (149) (249)
Adjusted net income (loss)                 $ 15,091 $ (7,881) $ 5,910
Diluted earnings (loss) per share, denominator:                      
Weighted-average 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
Adjusted weighted-average shares and assumed conversions 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
Earnings (loss) per common share (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]
Outstanding stock awards not included in calculation of diluted earnings per share (in shares)                 800,000 700,000 900,000
[1] The Company uses the two‑class method for calculating earnings per share. See Note M.