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Acquisitions, Disposals, And Assets Held For Sale (Narrative) (Details)	12 Months Ended			0 Months Ended		12 Months Ended		0 Months Ended		12 Months Ended								0 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 USD ($)	Nov. 20, 2012 Indooroopilly Property [Member] USD ($)	Nov. 20, 2012 Indooroopilly Property [Member] AUD	Dec. 31, 2013 Indooroopilly Property [Member] USD ($)	Dec. 31, 2013 Indooroopilly Property [Member] AUD	Feb. 21, 2012 Taringa [Member] USD ($) property acre	Feb. 21, 2012 Taringa [Member] AUD acre	Dec. 31, 2011 Taringa [Member] USD ($)	Dec. 31, 2011 Taringa [Member] AUD	Dec. 31, 2013 Plano Cinema [Member] USD ($)	Dec. 31, 2014 Burwood [Member] USD ($) acre	Dec. 31, 2014 Burwood [Member] AUD	Dec. 31, 2014 Moonee Ponds [Member] USD ($) acre	Dec. 31, 2014 Moonee Ponds [Member] AUD	Dec. 31, 2013 Moonee Ponds [Member] AUD	Apr. 16, 2015 Moonee Ponds [Member] Scenario, Forecast [Member] AUD	Jan. 10, 2012 Coachella Land [Member] USD ($) acre	Dec. 31, 2014 Coachella Land [Member] item	Jan. 18, 2012 Chief Executive Officer [Member] Coachella Land [Member]
Acquisitions, Disposals, And Assets Held For Sale [Line Items]
Area of property								1.1us-gaap_AreaOfRealEstateProperty / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_TaringaMember	1.1us-gaap_AreaOfRealEstateProperty / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_TaringaMember				50,600,000.0us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember	50,600,000.0us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember	3.3us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_MooneePondsMember	3.3us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_MooneePondsMember			202us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_CoachellaLandMember
Sale price													$ 54,600,000rdi_RealEstatePropertySalePrice / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember	65,000,000rdi_RealEstatePropertySalePrice / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember
Proceeds from the sale property				12,400,000us-gaap_ProceedsFromSaleOfPropertyHeldForSale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_IndooroopillyPropertyMember	12,000,000us-gaap_ProceedsFromSaleOfPropertyHeldForSale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_IndooroopillyPropertyMember			1,900,000us-gaap_ProceedsFromSaleOfPropertyHeldForSale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_TaringaMember	1,800,000us-gaap_ProceedsFromSaleOfPropertyHeldForSale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_TaringaMember				5,900,000us-gaap_ProceedsFromSaleOfPropertyHeldForSale / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember	6,500,000us-gaap_ProceedsFromSaleOfPropertyHeldForSale / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember				23,000,000us-gaap_ProceedsFromSaleOfPropertyHeldForSale / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_MooneePondsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
Prepayment percentage													90.00%rdi_SaleAgreeementPrepaymentAsPercentageOfNetSalePriceOfPropertySold / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember	90.00%rdi_SaleAgreeementPrepaymentAsPercentageOfNetSalePriceOfPropertySold / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember
Land held for sale	11,052,000us-gaap_RealEstateHeldforsale		42,588,000us-gaap_RealEstateHeldforsale	12,500,000us-gaap_RealEstateHeldforsale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_IndooroopillyPropertyMember	12,100,000us-gaap_RealEstateHeldforsale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_IndooroopillyPropertyMember								42,600,000us-gaap_RealEstateHeldforsale / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember		11,600,000us-gaap_RealEstateHeldforsale / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_MooneePondsMember	12,400,000us-gaap_RealEstateHeldforsale / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_MooneePondsMember
Tax basis of property													37,400,000rdi_RealEstateTaxBasis / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember	45,300,000rdi_RealEstateTaxBasis / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember
Cash received from cinema acquisition	1,936,000rdi_ProceedsFromAcquisitionAndOrSettlement
Acquisition, liability incurred												320,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = rdi_PlanoCinemaMember
Net assets acquired												1,700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rdi_PlanoCinemaMember
Net gain on acquisition and settlement												1,400,000rdi_GainLossOnAcquisitionAndSettlementNet / us-gaap_BusinessAcquisitionAxis = rdi_PlanoCinemaMember
Purchase deposit																	2,300,000us-gaap_EarnestMoneyDeposits / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_MooneePondsMember
Purchase deposit, percentage															10.00%rdi_EarnestMoneyDepositAsPercentageOfPurchasePrice / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_MooneePondsMember	10.00%rdi_EarnestMoneyDepositAsPercentageOfPurchasePrice / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_MooneePondsMember
Impairment expense						318,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_IndooroopillyPropertyMember	306,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_IndooroopillyPropertyMember			369,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_TaringaMember	365,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_TaringaMember
Number of properties sold								3rdi_NumberOfPropertiesSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_TaringaMember	3rdi_NumberOfPropertiesSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdi_TaringaMember
Number of residential units																				800us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_CoachellaLandMember
Payment to acquire property																			5,500,000us-gaap_PaymentsToAcquireLand / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_CoachellaLandMember
Ownership percentage in equity method investment																					50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_CoachellaLandMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Purchase of notes receivable		1,800,000us-gaap_PaymentsToAcquireNotesReceivable
Gain on sale of discontinued operation		(320,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Operating property, net	$ 191,660,000us-gaap_PropertyPlantAndEquipmentNet		$ 186,889,000us-gaap_PropertyPlantAndEquipmentNet											52,100,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = rdi_BurwoodMember

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