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EMPLOYEE BENEFIT PLANS, Multiemployer Plans and Defined Contribution Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Multiemployer Plans [Abstract] |  |  |
Number of multiemployer plans | 9 |  |
Description of multiemployer plan | Contributions are generally based on union labor paid or cargo volume. A portion of such contributions is for unfunded accrued actuarial liabilities of the plans being funded over periods of 25 to 40 years, which began between 1967 and 1976. |  |
Schedule of Multiemployer Plans [Line Items] |  |  |
Maximum funded percentage of plans in the red zone (in hundredths) | 65.00% |  |
Maximum funded percentage of plans in the yellow zone (in hundredths) | 80.00% |  |
Minimum funded percentage of plans in the green zone (in hundredths) | 80.00% |  |
Threshold of total contributions for which plans and years are disclosed (in hundredths) | 5.00% |  |
Contributions of Matson | $ 10.5 | $ 10.2 | $ 9.7
401(k) Plan [Member] |  |  |
Defined Contribution Plans [Abstract] |  |  |
Contribution percentage, maximum (in hundredths) | 4.00% |  | 4.00%
Contribution expense | 2.2 |  | 1.4
Profit Sharing Plan [Member] |  |  |
Defined Contribution Plans [Abstract] |  |  |
Contribution percentage, minimum (in hundredths) | 1.00% |  |
Contribution percentage, maximum (in hundredths) | 3.00% |  |
Master, Mates and Pilots [Member] |  |  |
Schedule of Multiemployer Plans [Line Items] |  |  |
EIN/Pension Plan Number | 13-6372630/001 | 13-6372630/001 |
Pension Protection Act Zone Status | Green | Red |
FIP/RP Status Pending/ Implemented | None | None |
Contributions of Matson | 3.0 | 2.9 | 2.6
Surcharge Imposed | No | No | No
Expiration Date of Collective Bargaining Agreement, Minimum | Jun. 15, 2012 |  |
Expiration Date of Collective Bargaining Agreement, Maximum | Aug. 15, 2013 |  |
Special amortization rules provided by Public Law (in years) | 29 |  |
Number of collective-bargaining agreements based upon vessels that require contributions to the plan | 2 |  |
Number of vessels covered by Contract A | 13 |  |
Number of vessels covered by Contract B | 1 |  |
Hawaii Terminals Multiemployer Pension Plan [Member] |  |  |
Schedule of Multiemployer Plans [Line Items] |  |  |
EIN/Pension Plan Number | 20-0389370/001 | 20-0389370/001 |
Pension Protection Act Zone Status | Yellow | Yellow |
FIP/RP Status Pending/ Implemented | Implemented | Implemented |
Contributions of Matson | 5.2 | 5.2 | 5.0
Surcharge Imposed | No | No | No
Expiration Date of Collective Bargaining Agreement | Jun. 30, 2014 |  |
Hawaii Stevedoring Multiemployer Retirement Plan [Member] |  |  |
Schedule of Multiemployer Plans [Line Items] |  |  |
EIN/Pension Plan Number | 99-0314293/001 | 99-0314293/001 |
Pension Protection Act Zone Status | Yellow | Yellow |
FIP/RP Status Pending/ Implemented | Implemented | Implemented |
Contributions of Matson | 2.2 | 2.0 | 2.0
Surcharge Imposed | No | No | No
Expiration Date of Collective Bargaining Agreement | Jun. 30, 2014 |  |
OCU Trust Pension [Member] |  |  |
Schedule of Multiemployer Plans [Line Items] |  |  |
EIN/Pension Plan Number | 26-1574440/001 | 26-1574440/001 |
Pension Protection Act Zone Status | Green | Green |
FIP/RP Status Pending/ Implemented | None | None |
Contributions of Matson | $ 0.1 | $ 0.1 | $ 0.1
Surcharge Imposed | No | No | No
Expiration Date of Collective Bargaining Agreement | Jun. 30, 2010 |  |

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- Definition The maximum percentage of contributions to the plan, based on pre-defined criteria (e.g. eligible employee compensation or Company performance above minimum threshold). + References No definition available. + Details
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- Definition The minimum percentage of contributions to the plan, based on pre-defined criteria (e.g. eligible employee compensation or Company performance above minimum threshold). + References No definition available. + Details
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- Definition The EIN/Pension Plan Number for the disclosed pension fund in the multiemployer plan. + References No definition available. + Details
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- Definition The Expiration Date of Collective Bargaining Agreement for the disclosed pension fund in the multiemployer plan. + References No definition available. + Details
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- Definition The earliest Expiration Date of Collective Bargaining Agreement for the disclosed pension fund in the multiemployer plan. + References No definition available. + Details
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- Definition The latest Expiration Date of Collective Bargaining Agreement for the disclosed pension fund in the multiemployer plan. + References No definition available. + Details
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- Definition The FIP/RP Status (Pending or Implemented) for the disclosed pension fund in the multiemployer plan. + References No definition available. + Details
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- Definition The maximum funded percentage of multiemployer plans in the red zone. + References No definition available. + Details
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- Definition The maximum funded percentage of multiemployer plans in the yellow zone. + References No definition available. + Details
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- Definition The minimum funded percentage of multiemployer plans in the green zone. + References No definition available. + Details
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- Definition The number of multiemployer plans. + References No definition available. + Details
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- Definition The Pension Protection Act Zone Status for the disclosed pension fund in the multiemployer plan. + References No definition available. + Details
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- Definition The threshold of total contributions for which multiemployer plans and years are disclosed. + References No definition available. + Details
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- Definition The number of collective-bargaining agreements based upon vessels that require contributions to the plan to which Mason is a party to. + References No definition available. + Details
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- Definition The number of vessels covered by Contract A relating to the collective-bargaining agreements. + References No definition available. + Details
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- Definition The number of years amortization period provided by Public Law 111-192, Section 211 for the amortization of losses. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition General descriptive information regarding an employer's multiemployer plans. A multiemployer plan is a plan to which two or more unrelated employers contribute, usually pursuant to one or more collective-bargaining agreements. A characteristic of multiemployer plans is that assets contributed by one participating employer may be used to provide benefits to employees of other participating employers since assets contributed by one employer are not segregated in a separate account or restricted to provide benefits only to employees of that employer. A multiemployer plan is usually administered by a board of trustees composed of management and labor representatives and may also be referred to as a "joint trust" or "union" plan. Generally, many employers participate in a multiemployer plan, and an employer may participate in more than one plan. The employers participating in multiemployer plans usually have a common industry bond, but for some plans the employers are in different industries and the labor union may be their only common bond. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 80 -Topic 715 -URI http://asc.fasb.org/extlink&oid=6958064&loc=d3e29142-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 67 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Multiemployer Plan -URI http://asc.fasb.org/extlink&oid=6517991 + Details
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- Definition Amount of contributions made to multiemployer plans for each period for which a statement of income is presented. An employer may disclose total contributions to multiemployer plans without disaggregating the amounts attributable to pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 80 -Topic 715 -URI http://asc.fasb.org/extlink&oid=6958064&loc=d3e29142-114947 + Details
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