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Property And Equipment (Gain On Sale Of Property) (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] $ in Thousands, $ in Millions | Mar. 31, 2021 USD ($) | Mar. 05, 2021 USD ($) | Mar. 04, 2021 USD ($) | Mar. 04, 2021 NZD ($)
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Coachella, CA [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Sale price | $ 11,000 | $ 11,000 |  |
Net book value | (4,351) |  |  |
Gain on sale, gross of direct costs | 6,649 |  |  |
Direct costs incurred | (301) |  |  |
Gain on sale, net of direct costs | 6,348 |  |  |
Manukau, NZ [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Sale price | 56,058 |  | $ 56,100 | $ 77.2
Net book value | (13,483) |  |  |
Gain on sale, gross of direct costs | 42,575 |  |  |
Direct costs incurred | (1,513) |  |  |
Gain on sale, net of direct costs | $ 41,062 |  |  |

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- Definition Disposal Group, Including Discontinued Operation, Direct Costs Incurred + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disposal Group, Including Discontinued Operation, Gain (Loss) On Sale, Gross + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Disposal Group, Including Discontinued Operation, Gain (Loss) On Sale, Net + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Real Estate Property Sale Price + References No definition available. + Details
Name: | rdi_RealEstatePropertySalePrice
Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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Data Type: | xbrli:monetaryItemType
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |