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Non-controlling Interests (Components Of Non-controlling Interests) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Noncontrolling Interest [Line Items] |  |
Non-controlling interests in consolidated subsidiaries | $ 4,337 | $ 4,331
Australian Country Cinemas, Pty Ltd [Member] |  |
Noncontrolling Interest [Line Items] |  |
Non-controlling interests in consolidated subsidiaries | 89 | 138
Sutton Hill Properties, LLC [Member] |  |
Noncontrolling Interest [Line Items] |  |
Non-controlling interests in consolidated subsidiaries | 2,095 | 2,066
Shadow View Land And Farming, LLC [Member] |  |
Noncontrolling Interest [Line Items] |  |
Non-controlling interests in consolidated subsidiaries | $ 2,153 | $ 2,127

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- Definition Noncontrolling interests in consolidated subsidiaries. + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
Name: | srt_ConsolidatedEntitiesAxis=rdi_AustraliaCountryCinemasMember
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: |

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