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Lease Agreements (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leased Assets [Line Items]
Base rent	$ 30,900,000us-gaap_LeaseAndRentalExpense	$ 32,100,000us-gaap_LeaseAndRentalExpense	$ 32,600,000us-gaap_LeaseAndRentalExpense
Contingent rental expense	1,200,000us-gaap_OperatingLeasesRentExpenseContingentRentals	1,300,000us-gaap_OperatingLeasesRentExpenseContingentRentals	1,700,000us-gaap_OperatingLeasesRentExpenseContingentRentals
Total minimum lease payments	192,208,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Monthly equipment lease payment			218,000rdi_MonthlyEquipmentLeasePayment
Equipment lease payments term			60 months
Australia [Member]
Operating Leased Assets [Line Items]
Number of properties leased	16rdi_NumberOfPropertiesLeased / us-gaap_StatementGeographicalAxis = country_AU
Number of properties	20us-gaap_NumberOfRealEstateProperties / us-gaap_StatementGeographicalAxis = country_AU
New Zealand [Member]
Operating Leased Assets [Line Items]
Number of properties leased	3rdi_NumberOfPropertiesLeased / us-gaap_StatementGeographicalAxis = country_NZ
Number of properties	8us-gaap_NumberOfRealEstateProperties / us-gaap_StatementGeographicalAxis = country_NZ
United States [Member]
Operating Leased Assets [Line Items]
Number of properties not leased	1rdi_NumberOfPropertiesNotLeased / us-gaap_StatementGeographicalAxis = country_US
Australia And New Zealand [Member]
Operating Leased Assets [Line Items]
Total minimum lease payments	62,500,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_StatementGeographicalAxis = rdi_AustraliaAndNewZealandMember
Minimum [Member]
Operating Leased Assets [Line Items]
Lease term	1 year
Maximum [Member]
Operating Leased Assets [Line Items]
Lease term	37 years
Equipment Lease [Member]
Operating Leased Assets [Line Items]
Lease term			5 years
Total minimum lease payments	$ 8,062,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue / us-gaap_MajorPropertyClassAxis = rdi_EquipmentLeaseMember

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Monthly Equipment Lease Payment

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Number Of Properties Leased

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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The number of real estate properties owned as of the balance sheet date.

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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

-Publisher FASB

-Name Accounting Standards Codification

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

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