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CAPITAL CONSTRUCTION FUND (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Maximum period to commit fund deposits for qualified purposes	25 years
Period over which deposits will be treated as non-qualified withdrawals	5 years
Cash deposits	$ 31.9us-gaap_IncreaseInRestrictedCash	$ 4.4us-gaap_IncreaseInRestrictedCash	$ 4.4us-gaap_IncreaseInRestrictedCash
Qualified Withdrawals	4.4us-gaap_DecreaseInRestrictedCash	4.4us-gaap_DecreaseInRestrictedCash	4.4us-gaap_DecreaseInRestrictedCash
Capital Construction Fund deposits	27.5matx_NetBalanceOfAmountsAccruedForCapitalConstructionFund	0matx_NetBalanceOfAmountsAccruedForCapitalConstructionFund
CAPITAL CONSTRUCTION FUND Total
Total Deposits	69.9us-gaap_AdditionsToOtherAssetsAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember	116.2us-gaap_AdditionsToOtherAssetsAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember
Total Qualified Withdrawals	(4.4)us-gaap_ReductionsInOtherAssetsAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember	(4.4)us-gaap_ReductionsInOtherAssetsAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember
Interest Earned	0.7us-gaap_InterestIncomeExpenseNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember	0.2us-gaap_InterestIncomeExpenseNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember
CAPITAL CONSTRUCTION FUND Balance	178.2us-gaap_OtherAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember	112.0us-gaap_OtherAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember
Eligible Accounts Receivable Assigned to CCF
Deposits from eligible accounts receivable	38.0us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember	111.8us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember
Interest Earned	0.7us-gaap_InterestIncomeExpenseNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember	0.2us-gaap_InterestIncomeExpenseNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember
CAPITAL CONSTRUCTION FUND Balance	150.7us-gaap_OtherAssets / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember	112.0us-gaap_OtherAssets / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember
Cash
Cash deposits	31.9us-gaap_IncreaseInRestrictedCash / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CashMember	4.4us-gaap_IncreaseInRestrictedCash / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CashMember
Qualified Withdrawals	(4.4)us-gaap_DecreaseInRestrictedCash / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CashMember	(4.4)us-gaap_DecreaseInRestrictedCash / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CashMember
CAPITAL CONSTRUCTION FUND Balance	$ 27.5us-gaap_OtherAssets / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CashMember

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- Definition

Represents the maximum period from the date of deposit to commit deposits for qualified purposes.

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The net balance of amount accrued for withdrawal and deposits to the Capital Construction Fund, reflected in the consolidated balance sheets.

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The period over which deposits not committed for qualified purposes longer than the maximum specified period from the date of deposit will be treated as non-qualified withdrawals.

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Amount of significant additions in the period in other assets (current, noncurrent, or unclassified).

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