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Non-controlling Interests (Components Of Non-controlling Interests) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2025 | Dec. 31, 2024
Noncontrolling Interest [Line Items] |  |
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries | $ (950) | $ (426)
Australian Country Cinemas, Pty Ltd [Member] |  |
Noncontrolling Interest [Line Items] |  |
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries | 126 | 128
Shadow View Land And Farming, LLC [Member] |  |
Noncontrolling Interest [Line Items] |  |
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries | (2) | (2)
Sutton Hill Properties, LLC [Member] |  |
Noncontrolling Interest [Line Items] |  |
Net income (loss) attributable to non-controlling interests in consolidated subsidiaries | $ (1,074) | $ (552)

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- Definition Noncontrolling interests in consolidated subsidiaries. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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

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