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Borrowings (Minetta And Orpheum Theatres Loan) (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 12, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Loan amount |  | $ 252,929 | $ 271,732
Minetta And Orpheum Theatres Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Loan amount |  | $ 8,000 | $ 7,500
Minetta And Orpheum Theatres Loan [Member] | Santander Bank [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Loan amount | $ 8,000 |  |
Debt instrument term |  | 5 years |

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- Definition Debt Instrument Contractual Facility Borrowing Capacity + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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- Details
Name: | us-gaap_DebtInstrumentAxis=rdi_MinettaAndOrpheumTheatresLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=rdi_SantanderBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |