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EMPLOYEE BENEFIT PLANS (Details 8) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Minimum
Dec. 31, 2012
Yellow Zone
Hawaii Stevedoring Multiemployer Retirement Plan
Dec. 31, 2011
Yellow Zone
Hawaii Stevedoring Multiemployer Retirement Plan
Dec. 31, 2010
Yellow Zone
Hawaii Stevedoring Multiemployer Retirement Plan
Dec. 31, 2012
Yellow Zone
Hawaii Terminals Multiemployer Pension Plan
Dec. 31, 2011
Yellow Zone
Hawaii Terminals Multiemployer Pension Plan
Dec. 31, 2010
Yellow Zone
Hawaii Terminals Multiemployer Pension Plan
Dec. 31, 2012
Green Zone
Master, Mates and Pilots
Dec. 31, 2011
Green Zone
Master, Mates and Pilots
Dec. 31, 2010
Green Zone
Master, Mates and Pilots
Dec. 31, 2012
Green Zone
MEBA Pension Trust
Dec. 31, 2012
Green Zone
OCU Trust Pension
Dec. 31, 2011
Green Zone
OCU Trust Pension
Dec. 31, 2010
Green Zone
OCU Trust Pension
Dec. 31, 2012
Multiemployer Benefit Pension Plans
item
Dec. 31, 2012
Multiemployer Benefit Pension Plans
Contract A
item
Jun. 15, 2012
Multiemployer Benefit Pension Plans
Contract B
item
Dec. 31, 2012
Multiemployer Benefit Pension Plans
Red Zone
Maximum
Dec. 31, 2012
Multiemployer Benefit Pension Plans
Yellow Zone
Maximum
Dec. 31, 2012
Multiemployer Benefit Pension Plans
Green Zone
Minimum
Dec. 31, 2012
Multiemployer Benefit Postretirement Plans
item
Dec. 31, 2011
Multiemployer Benefit Postretirement Plans
Dec. 31, 2010
Multiemployer Benefit Postretirement Plans
Multiemployer Plans                                                    
Number of multiemployer plans                                   9           7    
Funded status of multiemployer plan (as a percent)                                         65.00% 80.00% 80.00%      
Contributions $ 13.1 $ 10.5 $ 10.2   $ 2.4 $ 2.2 $ 2.0 $ 5.1 $ 5.2 $ 5.2 $ 3.4 $ 3.0 $ 2.9 $ 2.1 $ 0.1 $ 0.1 $ 0.1             $ 10.8 $ 10.7 $ 10.5
Amortization period provided by Public Law to amortize losses                                   29 years                
Number of collective-bargaining agreements                                   2                
Number of vessels covered                                     13 1            
Employer matching contribution to MEBA Pension Trust (as a percent)       11.70%                                            
Threshold of total contributions for which planned years are disclosed (as a percent)       5.00%