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Debt (Details 4) (USD $)
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3 Months Ended |
12 Months Ended |
15 Months Ended |
0 Months Ended |
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Mar. 31, 2015
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Dec. 31, 2014
acre
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Mar. 31, 2015
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Mar. 31, 2015
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Apr. 30, 2015
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| Debt Instrument [Line Items] |
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| Borrowings of debt |
$ 1,275,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
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| ANLBC |
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| Debt Instrument [Line Items] |
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| Area of land aquired (in acres) |
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82lmca_AreaOfLandAcquiredInAcres / dei_LegalEntityAxis = lmca_AnlbcMember
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| Number of credit facilities |
2lmca_NumberOfCreditFacilities / dei_LegalEntityAxis = lmca_AnlbcMember
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| ANLBC | Cobb County Major League Baseball Ballpark |
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| Debt Instrument [Line Items] |
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| Construction and Development Costs |
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131,000,000us-gaap_ConstructionAndDevelopmentCosts / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember
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| Line of Credit Facility, Maximum Borrowing Capacity |
250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember
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250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember
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250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember
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350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember
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| ANLBC | Cobb County Major League Baseball Ballpark | Revolving Credit Facility |
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| Debt Instrument [Line Items] |
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| Borrowings of debt |
110,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember
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| ANLBC | Forecast | Cobb County Major League Baseball Ballpark |
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| Debt Instrument [Line Items] |
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| Construction and Development Costs |
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672,000,000us-gaap_ConstructionAndDevelopmentCosts / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
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| Other costs and equipment |
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50,000,000lmca_OtherCostsAndEquipment / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
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| ANLBC | Cobb Marietta Coliseum And Exhibit Hall Authority | Cobb County Major League Baseball Ballpark |
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| Debt Instrument [Line Items] |
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| Due from affiliate |
392,000,000us-gaap_DueFromAffiliates / us-gaap_CounterpartyNameAxis = lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember
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392,000,000us-gaap_DueFromAffiliates / us-gaap_CounterpartyNameAxis = lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember
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392,000,000us-gaap_DueFromAffiliates / us-gaap_CounterpartyNameAxis = lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember
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| ANLBC | Cobb Marietta Coliseum And Exhibit Hall Authority | Forecast | Cobb County Ballpark Mixed Use Development |
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| Debt Instrument [Line Items] |
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| Due from affiliate |
363,000,000us-gaap_DueFromAffiliates / us-gaap_CounterpartyNameAxis = lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyBallparkMixedUseDevelopmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
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363,000,000us-gaap_DueFromAffiliates / us-gaap_CounterpartyNameAxis = lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyBallparkMixedUseDevelopmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
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363,000,000us-gaap_DueFromAffiliates / us-gaap_CounterpartyNameAxis = lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyBallparkMixedUseDevelopmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
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| ANLBC | Affiliated Entities | Forecast | Cobb County Ballpark Mixed Use Development |
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| Debt Instrument [Line Items] |
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| Construction and Development Costs |
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452,000,000us-gaap_ConstructionAndDevelopmentCosts / us-gaap_CounterpartyNameAxis = lmca_AffiliatedEntitiesMember / dei_LegalEntityAxis = lmca_AnlbcMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyBallparkMixedUseDevelopmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
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| Cobb Marietta Coliseum And Exhibit Hall Authority | Forecast | Cobb County Major League Baseball Ballpark | Bonds Payable |
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| Debt Instrument [Line Items] |
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| Debt issuance amount |
$ 368,000,000us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
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$ 368,000,000us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
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$ 368,000,000us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = lmca_CobbCountyMajorLeagueBaseballBallparkMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
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