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Non-controlling Interests (Components Of Non-controlling Interests) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Noncontrolling Interest [Line Items] |  |
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries | $ 993 | $ 3,404
Australian Country Cinemas, Pty Ltd [Member] |  |
Noncontrolling Interest [Line Items] |  |
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries | (3) | (51)
Shadow View Land And Farming, LLC [Member] |  |
Noncontrolling Interest [Line Items] |  |
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries | (3) | 2,131
Sutton Hill Properties, LLC [Member] |  |
Noncontrolling Interest [Line Items] |  |
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries | $ 999 | $ 1,324

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- Definition Noncontrolling interests in consolidated subsidiaries. + References No definition available. + 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
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- Details
Name: | dei_LegalEntityAxis=rdi_AustraliaCountryCinemasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=rdi_ShadowViewLandAndFarmingLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=rdi_SuttonHillPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |