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Investment And Development Property (Summary Of Investment And Development Property) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Property, Plant and Equipment [Line Items] |  |
Investment and development property, net | $ 26,124 rdi_PropertyHeldForAndUnderDevelopment | $ 74,230 rdi_PropertyHeldForAndUnderDevelopment
Land [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Investment and development property, net | 23,833 rdi_PropertyHeldForAndUnderDevelopment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember | 59,550 rdi_PropertyHeldForAndUnderDevelopment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Construction-In-Progress (Including Capitalized Interest) [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Investment and development property, net | $ 2,291 rdi_PropertyHeldForAndUnderDevelopment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = rdi_ConstructionInProgressIncludingCapitalizedInterestMember | $ 14,680 rdi_PropertyHeldForAndUnderDevelopment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = rdi_ConstructionInProgressIncludingCapitalizedInterestMember

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- Definition Properties owned by the entity in a status of either being held for development or currently under development for the ultimate purpose to either sell or be operated by the entity. + References No definition available. + Details
Name: | rdi_PropertyHeldForAndUnderDevelopment
Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=rdi_ConstructionInProgressIncludingCapitalizedInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |