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DESCRIPTION OF THE BUSINESS (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended		0 Months Ended
	Nov. 11, 2014	Dec. 31, 2014 segment item	Dec. 31, 2012	Jun. 29, 2012	Jun. 08, 2012	Dec. 01, 2011 company
DESCRIPTION OF THE BUSINESS
Number of segments		2us-gaap_NumberOfReportableSegments
Number of vessels owned		18matx_NumberOfShipsOwned
Number of chartered vessels		3matx_NumberOfCharteredVessels
Horizon Acquisition
Acquisition Value	$ 456.0us-gaap_BusinessCombinationConsiderationTransferred1
Separation costs			8.6matx_SeparationCost
Ocean Transportation | SSAT
DESCRIPTION OF THE BUSINESS
Ownership interest in SSAT (as a percent)		35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Number of terminal facilities on which SSAT provides terminal and stevedoring services to Matnav and numerous carriers		6matx_NumberOfTerminalFacilitiesOnWhichInvesteeProvidesTerminalAndStevedoringServices / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = matx_SsaTerminalsLlcMember / us-gaap_StatementBusinessSegmentsAxis = matx_OceanTransportationSegmentMember
Alexander & Baldwin
Horizon Acquisition
Number of publicly traded companies to be created after separation						2matx_NumberOfCompaniesToBeCreatedAfterSeparation / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember
Jones Act requirement to maintain status as U.S. citizen, maximum ownership interest permitted by non-U.S. citizens (as a percent)		22.00%matx_MaximumOwnershipPercentageThatMayBeOwnedByNonUSCitizens / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember
Number of shares of common stock of A&B received for each share upon separation				1us-gaap_ConversionOfStockSharesConverted1 / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember
Maximum period during which services are to be provided under Transition Services Agreement					24 months
Capital contribution to A&B			155.7matx_SeparationCostCapitalDistributions / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember
Separation costs			8.6matx_SeparationCost / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember
Capitalized debt financing costs			1.9us-gaap_PaymentsOfDebtIssuanceCosts / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember
Total cash outflow related to the Separation			$ 166.2matx_PaymentsRelatedToSeparation / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember

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- Definition

Represents the maximum permitted ownership percentage by non-U.S. citizens in order to maintain the entity's status as a U.S. citizen under certain U.S. maritime and vessel documentation laws, popularly referred to as the Jones Act.

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Represents the number of chartered vessels.

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Represents the number of companies to be created after separation for which the board of directors unanimously approved a plan to pursue the separation.

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Represents the number of ships owned by the entity.

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Represents the number of ports terminal facilities on which the investee provides terminal and stevedoring services.

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Represents the total cash outflows in relation to the separation from the reporting entity during the period.

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Professional fees and other costs associated with the spin-off of the Company's non-transportation segments.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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