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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 | $ 31.9 us-gaap_IncreaseInRestrictedCash | $ 4.4 us-gaap_IncreaseInRestrictedCash | $ 4.4 us-gaap_IncreaseInRestrictedCash
Qualified Withdrawals | 4.4 us-gaap_DecreaseInRestrictedCash | 4.4 us-gaap_DecreaseInRestrictedCash | 4.4 us-gaap_DecreaseInRestrictedCash
Capital Construction Fund deposits | 27.5 matx_NetBalanceOfAmountsAccruedForCapitalConstructionFund | 0 matx_NetBalanceOfAmountsAccruedForCapitalConstructionFund |
CAPITAL CONSTRUCTION FUND Total |  |  |
Total Deposits | 69.9 us-gaap_AdditionsToOtherAssetsAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember | 116.2 us-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 | 0.7 us-gaap_InterestIncomeExpenseNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember | 0.2 us-gaap_InterestIncomeExpenseNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember |
CAPITAL CONSTRUCTION FUND Balance | 178.2 us-gaap_OtherAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember | 112.0 us-gaap_OtherAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember |
Eligible Accounts Receivable Assigned to CCF |  |  |
Deposits from eligible accounts receivable | 38.0 us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember | 111.8 us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember |
Interest Earned | 0.7 us-gaap_InterestIncomeExpenseNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember | 0.2 us-gaap_InterestIncomeExpenseNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember |
CAPITAL CONSTRUCTION FUND Balance | 150.7 us-gaap_OtherAssets / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember | 112.0 us-gaap_OtherAssets / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_TradeAccountsReceivableMember |
Cash |  |  |
Cash deposits | 31.9 us-gaap_IncreaseInRestrictedCash / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CashMember | 4.4 us-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 | $ 27.5 us-gaap_OtherAssets / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = us-gaap_CashMember |  |

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