XML 41 R32.htm IDEA: XBRL DOCUMENT
v3.23.2

DESCRIPTION OF THE BUSINESS (Details) | 6 Months Ended
--- | ---
Jun. 30, 2023 facility segment
DESCRIPTION OF THE BUSINESS |
Number of reportable segments | segment | 2
Ocean Transportation | SSAT |
DESCRIPTION OF THE BUSINESS |
Ownership interest in SSAT (as a percent) | 35.00%
Number of terminal facilities on which SSAT provides terminal and stevedoring services on the U.S. West Coast | 8
MatNav | SSAT |
DESCRIPTION OF THE BUSINESS |
Number of terminal facilities on which SSAT provides terminal and stevedoring services on the U.S. West Coast | 3

X
- Definition Line items represent description about business. + References No definition available. + Details
Name: | matx_DescriptionOfBusinessLineItems
Namespace Prefix: | matx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of ports terminal facilities on which the investee provides terminal and stevedoring services. + References No definition available. + Details
Name: | matx_NumberOfTerminalFacilitiesOnWhichInvesteeProvidesTerminalAndStevedoringServices
Namespace Prefix: | matx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=matx_OceanTransportationSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=matx_SsaTerminalsLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=matx_MatNavMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |