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Notes Payable (New Zealand Corporate Credit Facility) (Narrative) (Details) In Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 Previous New Zealand Corporate Credit Facility [Member] | Feb. 08, 2012 Previous New Zealand Corporate Credit Facility [Member] USD ($) | Feb. 08, 2012 Previous New Zealand Corporate Credit Facility [Member] NZD | Dec. 31, 2014 New Zealand Corporate Credit Facility [Member] USD ($) | Dec. 31, 2014 New Zealand Corporate Credit Facility [Member] NZD
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 36.9 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_PreviousNewZealandCorporateCreditFacilityMember | 45.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_PreviousNewZealandCorporateCreditFacilityMember | $ 32.8 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember | 40.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember
Line of credit facility, term |  |  |  | 3 years | 3 years
Line of credit facility, decrease in maximum borrowing capacity |  |  |  | $ 4.1 rdi_LineOfCreditFacilityIncreaseDecreaseInMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember | 5.0 rdi_LineOfCreditFacilityIncreaseDecreaseInMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember
Increase in spread on variable interest rate | 0.55%rdi_DebtInstrumentIncreaseDecreaseInBasisSpreadOnVariableRate / us-gaap_DebtInstrumentAxis = rdi_PreviousNewZealandCorporateCreditFacilityMember |  |  |  |
Spread on variable interest rate |  |  |  | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember
Line of credit facility charge | 0.30%rdi_LineOfCreditFacilityChargePercentage / us-gaap_DebtInstrumentAxis = rdi_PreviousNewZealandCorporateCreditFacilityMember |  |  | 0.40%rdi_LineOfCreditFacilityChargePercentage / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember | 0.40%rdi_LineOfCreditFacilityChargePercentage / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember

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- Definition Debt Instrument, Increase Decrease In Basis Spread On Variable Rate + References No definition available. + Details
Name: | rdi_DebtInstrumentIncreaseDecreaseInBasisSpreadOnVariableRate
Namespace Prefix: | rdi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line Of Credit Facility Charge, Percentage + References No definition available. + Details
Name: | rdi_LineOfCreditFacilityChargePercentage
Namespace Prefix: | rdi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line Of Credit Facility, Increase Decrease In Maximum Borrowing Capacity + References No definition available. + Details
Name: | rdi_LineOfCreditFacilityIncreaseDecreaseInMaximumBorrowingCapacity
Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant