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RELATED PARTY TRANSACTIONS (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related Party Transactions |  |  |
Lease expense to A & B | $ (27.6)us-gaap_LeaseAndRentalExpense | $ (20.5)us-gaap_LeaseAndRentalExpense | $ (17.8)us-gaap_LeaseAndRentalExpense
Contributions to A&B |  |  | 155.7 matx_PaymentsForDistributionUponSeparation
Alexander & Baldwin |  |  |
Related Party Transactions |  |  |
Vessel management services income |  |  | 2.0 us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = matx_AlexanderAndBaldwinIncMember
Lease expense to A & B |  |  | (2.1)us-gaap_LeaseAndRentalExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = matx_AlexanderAndBaldwinIncMember
Equipment and repair services expense and other |  |  | (1.4)us-gaap_EquipmentExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = matx_AlexanderAndBaldwinIncMember
Related party expense, net |  |  | (1.5)matx_RelatedPartyTransactionNetExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = matx_AlexanderAndBaldwinIncMember
Contributions to A&B | 0 matx_PaymentsForDistributionUponSeparation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = matx_AlexanderAndBaldwinIncMember | 0 matx_PaymentsForDistributionUponSeparation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = matx_AlexanderAndBaldwinIncMember | 155.7 matx_PaymentsForDistributionUponSeparation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = matx_AlexanderAndBaldwinIncMember
Proceeds from and contributions to A&B from issuance of capital stock |  |  | 21.7 matx_ProceedsFromAndDistributionsToAAndBFromIssuanceOfCapitalStock / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = matx_AlexanderAndBaldwinIncMember
Contributions from A&B | $ 0 us-gaap_ProceedsFromContributionsFromParent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = matx_AlexanderAndBaldwinIncMember | $ 0 us-gaap_ProceedsFromContributionsFromParent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = matx_AlexanderAndBaldwinIncMember | $ 25.0 us-gaap_ProceedsFromContributionsFromParent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = matx_AlexanderAndBaldwinIncMember

X
- Definition Total cash outflows in relation to the separation from the Former Parent Company during the reporting period. + References No definition available. + Details
Name: | matx_PaymentsForDistributionUponSeparation
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total cash flow related to the issuance of stock to A&B. + References No definition available. + Details
Name: | matx_ProceedsFromAndDistributionsToAAndBFromIssuanceOfCapitalStock
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net expense recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
Name: | matx_RelatedPartyTransactionNetExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses. + References No definition available. + Details
Name: | us-gaap_EquipmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from parent as a source of financing that is recorded as additional paid in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Paragraph b -Subparagraph 1 -Article 6 + Details
Name: | us-gaap_RevenueFromRelatedParties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Balance Type: |
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