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Quarterly report pursuant to Section 13 or 15(d)

Debt (Details 4)

v2.4.1.9
Debt (Details 4) (USD $)
 3 Months Ended 12 Months Ended 15 Months Ended 0 Months Ended
Mar. 31, 2015
Dec. 31, 2014
acre
Mar. 31, 2015
Mar. 31, 2015
Apr. 30, 2015
Debt Instrument [Line Items] Ìý Ìý Ìý Ìý Ìý
Borrowings of debt $ 1,275,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt Ìý Ìý Ìý Ìý
ANLBC Ìý Ìý Ìý Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý Ìý Ìý Ìý
Area of land aquired (in acres) Ìý 82lmca_AreaOfLandAcquiredInAcres
/ dei_LegalEntityAxis
= lmca_AnlbcMember 		Ìý Ìý Ìý
Number of credit facilities 2lmca_NumberOfCreditFacilities
/ dei_LegalEntityAxis
= lmca_AnlbcMember 		Ìý Ìý Ìý Ìý
ANLBC | Cobb County Major League Baseball Ballpark Ìý Ìý Ìý Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý Ìý Ìý Ìý
Construction and Development Costs Ìý Ìý 131,000,000us-gaap_ConstructionAndDevelopmentCosts
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember 		Ìý Ìý
Line of Credit Facility, Maximum Borrowing Capacity 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember 		Ìý 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember 		250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember 		350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
ANLBC | Cobb County Major League Baseball Ballpark | Revolving Credit Facility Ìý Ìý Ìý Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý Ìý Ìý Ìý
Borrowings of debt 110,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember 		Ìý Ìý Ìý Ìý
ANLBC | Forecast | Cobb County Major League Baseball Ballpark Ìý Ìý Ìý Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý Ìý Ìý Ìý
Construction and Development Costs Ìý Ìý Ìý 672,000,000us-gaap_ConstructionAndDevelopmentCosts
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember 		Ìý
Other costs and equipment Ìý Ìý Ìý 50,000,000lmca_OtherCostsAndEquipment
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember 		Ìý
ANLBC | Cobb Marietta Coliseum And Exhibit Hall Authority | Cobb County Major League Baseball Ballpark Ìý Ìý Ìý Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý Ìý Ìý Ìý
Due from affiliate 392,000,000us-gaap_DueFromAffiliates
/ us-gaap_CounterpartyNameAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember 		Ìý 392,000,000us-gaap_DueFromAffiliates
/ us-gaap_CounterpartyNameAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember 		392,000,000us-gaap_DueFromAffiliates
/ us-gaap_CounterpartyNameAxis
= lmca_CobbMariettaColiseumAndExhibitHallAutthorityMember
/ dei_LegalEntityAxis
= lmca_AnlbcMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= lmca_CobbCountyMajorLeagueBaseballBallparkMember 		Ìý
ANLBC | Cobb Marietta Coliseum And Exhibit Hall Authority | Forecast | Cobb County Ballpark Mixed Use Development Ìý Ìý Ìý Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý Ìý Ìý Ìý
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 		Ìý 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 		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 		Ìý
ANLBC | Affiliated Entities | Forecast | Cobb County Ballpark Mixed Use Development Ìý Ìý Ìý Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý Ìý Ìý Ìý
Construction and Development Costs Ìý Ìý Ìý 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 		Ìý
Cobb Marietta Coliseum And Exhibit Hall Authority | Forecast | Cobb County Major League Baseball Ballpark | Bonds Payable Ìý Ìý Ìý Ìý Ìý
Debt Instrument [Line Items] Ìý Ìý Ìý Ìý Ìý
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 		Ìý $ 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 		$ 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 		Ìý