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Fair Value Of Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value Of Financial Instruments [Abstract]
Fair value of impaired real estate property			$ 4,100,000rdi_ImpairedRealEstatePropertyFairValue
Property impairment	$ 0us-gaap_ImpairmentOfRealEstate	$ 0us-gaap_ImpairmentOfRealEstate

X

- Details

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Namespace Prefix:	rdi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Impaired Real Estate Property, Fair Value

+ References

No definition available.

+ Details

Name:	rdi_ImpairedRealEstatePropertyFairValue
Namespace Prefix:	rdi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration