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STOCKHOLDERS' EQUITY (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2005 | Dec. 31, 2003
Total Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | $ 1,404,000 | $ 12,265,000 | $ 5,451,000 | $ (12,787,000) |  |  |  |  | $ (7,732,000) | $ 6,333,000 | $ (32,421,000) |  |
Less: Noncontrolling interest in net income of subsidiary |  |  |  |  |  |  | (153,000) | (21,000) |  |  |  |  |  | (174,000) | (272,000) |  |
NET INCOME (LOSS) ATTRIBUTABLE TO ARKANSAS BEST CORPORATION | (7,929,000) | 6,518,000 | 11,841,000 | (18,162,000) | 1,404,000 | 12,265,000 | 5,298,000 | (12,808,000) |  |  |  |  | (7,732,000) | 6,159,000 | (32,693,000) |  |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in foreign currency translation, net of tax of (2012 - $10; 2011 - $69; 2010 - $49) |  |  |  |  |  |  |  |  |  |  |  |  | 19,000 | (108,000) | 76,000 |  |
Change in foreign currency translation, tax |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 | 69,000 | 49,000 |  |
Unrecognized net actuarial gain (loss), net of tax of (2012 - $3,709; 2011 - $10,804; 2010 - $1,951) |  |  |  |  |  |  |  |  |  |  |  |  | (5,830,000) | (27,178,000) | 3,064,000 |  |
Unrecognized net actuarial gain, tax |  |  |  |  |  |  |  |  |  |  |  |  | 3,709,000 | 10,804,000 | 1,951,000 |  |
Amortization of unrecognized net periodic benefit costs, net of tax of (2012 - $4,354; 2011 - $2,789; 2010 - $3,119) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss |  |  |  |  |  |  |  |  |  |  |  |  | 6,957,000 | 4,497,000 | 4,819,000 |  |
Prior service credit |  |  |  |  |  |  |  |  |  |  |  |  | (116,000) | (115,000) | (4,000) |  |
Net transition obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82,000 |  |
Amortization of unrecognized net periodic benefit costs, tax |  |  |  |  |  |  |  |  |  |  |  |  | 4,354,000 | 2,789,000 | 3,119,000 |  |
Pension settlement expense, net of tax of (2012 - $0; 2011 - $438; 2010 - $69) |  |  |  |  |  |  |  |  |  |  |  |  |  | 687,000 | 109,000 |  |
Pension settlement expense, tax |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 438,000 | 69,000 |  |
Other, net of tax of (2012 - $0; 2011 - $70; 2010 - $7) |  |  |  |  |  |  |  |  |  |  |  |  |  | (132,000) | 13,000 |  |
Other, tax |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 70,000 | 7,000 |  |
OTHER COMPREHENSIVE INCOME (LOSS), net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 1,030,000 | (22,349,000) | 8,159,000 |  |
COMPREHENSIVE LOSS ATTRIBUTABLE TO ARKANSAS BEST CORPORATION |  |  |  |  |  |  |  |  |  |  |  |  | (6,702,000) | (16,190,000) | (24,534,000) |  |
Accumulated other comprehensive loss, pre-tax amounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | (662,000) |  |  |  | (691,000) |  |  |  | (514,000) |  |  |  | (662,000) | (691,000) | (514,000) |  |
Unrecognized net periodic benefit costs | (86,737,000) |  |  |  | (88,393,000) |  |  |  | (58,707,000) |  |  |  | (86,737,000) | (88,393,000) | (58,707,000) |  |
Other |  |  |  |  |  |  |  |  | 202,000 |  |  |  |  |  | 202,000 |  |
Total pre-tax amount | (87,399,000) |  |  |  | (89,084,000) |  |  |  | (59,019,000) |  |  |  | (87,399,000) | (89,084,000) | (59,019,000) |  |
Accumulated other comprehensive loss, after-tax amounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | (404,000) |  |  |  | (423,000) |  |  |  | (315,000) |  |  |  | (404,000) | (423,000) | (315,000) |  |
Unrecognized net periodic benefit costs | (56,968,000) |  |  |  | (57,979,000) |  |  |  | (35,870,000) |  |  |  | (56,968,000) | (57,979,000) | (35,870,000) |  |
Other |  |  |  |  |  |  |  |  | 132,000 |  |  |  |  |  | 132,000 |  |
Total after-tax amount | (57,372,000) |  |  |  | (58,402,000) |  |  |  | (36,053,000) |  |  |  | (57,372,000) | (58,402,000) | (36,053,000) |  |
Dividends on Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.12 | $ 0.12 | $ 0.12 |  |
Dividend Amount | 807,000 | 807,000 | 808,000 | 797,000 | 797,000 | 798,000 | 797,000 | 788,000 | 786,000 | 786,000 | 777,000 | 777,000 | 3,219,000 | 3,180,000 | 3,126,000 |  |
Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of stock repurchases authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 | 25,000,000
Additional amount of stock repurchases authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |
Shares repurchased | 1,618,150 |  |  |  |  |  |  |  |  |  |  |  | 1,618,150 |  |  |  |
Aggregate cost of shares repurchased | 56,800,000 |  |  |  |  |  |  |  |  |  |  |  | 56,800,000 |  |  |  |
Amount of shares available for repurchase under the current buyback program |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,200,000 |  |  |  |

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