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SHARE-BASED AWARDS (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based expense (net of estimated forfeitures) |  |  |
Total share-based expense | $ 8.7 us-gaap_AllocatedShareBasedCompensationExpense | $ 5.9 us-gaap_AllocatedShareBasedCompensationExpense | $ 4.0 us-gaap_AllocatedShareBasedCompensationExpense
Total recognized tax benefit | (3.4)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | (2.2)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | (1.6)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total share-based expense (net of tax) | 5.3 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 3.7 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 2.4 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Cash received by Matson upon option exercise | 5.8 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 1.7 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 3.5 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
Intrinsic value of options exercised | 3.4 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 1.1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 5.2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Tax benefit realized upon option exercise | 1.9 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | 1.7 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | 1.5 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Fair value of stock vested | 5.0 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | 4.4 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | 3.8 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Stock options |  |  |
Share-based expense (net of estimated forfeitures) |  |  |
Total share-based expense | 0.3 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 0.4 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 0.9 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Total recognized tax benefit | (0.8)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (0.6)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Non-vested stock and restricted stock units |  |  |
Share-based expense (net of estimated forfeitures) |  |  |
Total share-based expense | 8.4 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = matx_NonVestedStockAndRestrictedStockUnitsMember | 5.5 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = matx_NonVestedStockAndRestrictedStockUnitsMember | 3.1 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = matx_NonVestedStockAndRestrictedStockUnitsMember
Unrecognized compensation cost | $ 9.0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = matx_NonVestedStockAndRestrictedStockUnitsMember |  |
Unrecognized compensation cost, weighted average period for recognition | 1 year 8 months 12 days |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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