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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
Property, Plant and Equipment [Line Items]
Investment and development property, net	$ 26,124rdi_PropertyHeldForAndUnderDevelopment	$ 74,230rdi_PropertyHeldForAndUnderDevelopment
Land [Member]
Property, Plant and Equipment [Line Items]
Investment and development property, net	23,833rdi_PropertyHeldForAndUnderDevelopment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember	59,550rdi_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	$ 2,291rdi_PropertyHeldForAndUnderDevelopment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = rdi_ConstructionInProgressIncludingCapitalizedInterestMember	$ 14,680rdi_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

X

- 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: