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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 | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Feb. 28, 2021 USD ($) | Jan. 31, 2021 USD ($) | Jan. 31, 2021 AUD ($) | Dec. 31, 2020 USD ($)
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Real Estate Properties [Line Items] |  |  |  |  |  |  |
Sale price | $ 3,803 |  |  |  |  |  |
Net book value | (1,425) |  |  |  |  |  |
Gain on sale, gross of direct costs | 2,378 |  |  |  |  |  |
Direct costs incurred | (6) |  |  |  |  |  |
Gain on sale, net of direct costs | $ 2,372 |  |  |  |  |  |
Coachella, CA [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Sale price |  |  | $ 11,000 |  |  |  |
Net book value |  |  | (4,351) |  |  |  | $ (4,400)
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 |  |  |  |
Net book value |  |  | (13,618) |  |  |  | $ (13,600)
Gain on sale, gross of direct costs |  |  | 42,440 |  |  |  |
Direct costs incurred |  |  | (1,514) |  |  |  |
Gain on sale, net of direct costs |  |  | $ 40,926 |  |  |  |
New South Wales [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Sale price |  | $ 69,579 |  |  |  |  |
Net book value |  | (30,231) |  |  |  |  |
Gain on sale, gross of direct costs |  | 39,348 |  |  |  |  |
Direct costs incurred |  | (622) |  |  |  |  |
Gain on sale, net of direct costs |  | 38,726 |  |  |  |  |
Chicago [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Sale price |  | 7,075 |  |  |  |  |
Net book value |  | (1,824) |  | $ (1,800) | $ (30,200) | $ (39.1) |
Gain on sale, gross of direct costs |  | 5,251 |  |  |  |  |
Direct costs incurred |  | (295) |  |  |  |  |
Gain on sale, net of direct costs |  | $ 4,956 |  |  |  |  |

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

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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
Period Type: | instant

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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 https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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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_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
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- Details
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Data Type: | na
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- Details
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- Details
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- Details
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- Details
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