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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     155.7matx_PaymentsForDistributionUponSeparation
Alexander & Baldwin      
Related Party Transactions      
Vessel management services income     2.0us-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 0matx_PaymentsForDistributionUponSeparation
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= matx_AlexanderAndBaldwinIncMember
0matx_PaymentsForDistributionUponSeparation
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= matx_AlexanderAndBaldwinIncMember
155.7matx_PaymentsForDistributionUponSeparation
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= matx_AlexanderAndBaldwinIncMember
Proceeds from and contributions to A&B from issuance of capital stock     21.7matx_ProceedsFromAndDistributionsToAAndBFromIssuanceOfCapitalStock
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= matx_AlexanderAndBaldwinIncMember
Contributions from A&B $ 0us-gaap_ProceedsFromContributionsFromParent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= matx_AlexanderAndBaldwinIncMember
$ 0us-gaap_ProceedsFromContributionsFromParent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= matx_AlexanderAndBaldwinIncMember
$ 25.0us-gaap_ProceedsFromContributionsFromParent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= matx_AlexanderAndBaldwinIncMember