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Noncontrolling Interests (Components Of Noncontrolling Interests) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Noncontrolling Interest [Line Items] |  |
Noncontrolling interests in consolidated subsidiaries | $ 4,498 rdi_NoncontrollingInterestsInConsolidatedSubsidiaries | $ 4,612 rdi_NoncontrollingInterestsInConsolidatedSubsidiaries
Australia Country Cinemas [Member] |  |
Noncontrolling Interest [Line Items] |  |
Noncontrolling interests in consolidated subsidiaries | 313 rdi_NoncontrollingInterestsInConsolidatedSubsidiaries / dei_LegalEntityAxis = rdi_AustraliaCountryCinemasMember | 410 rdi_NoncontrollingInterestsInConsolidatedSubsidiaries / dei_LegalEntityAxis = rdi_AustraliaCountryCinemasMember
Shadow View Land And Farming LLC [Member] |  |
Noncontrolling Interest [Line Items] |  |
Noncontrolling interests in consolidated subsidiaries | 2,005 rdi_NoncontrollingInterestsInConsolidatedSubsidiaries / dei_LegalEntityAxis = rdi_ShadowViewLandAndFarmingLlcMember | 2,000 rdi_NoncontrollingInterestsInConsolidatedSubsidiaries / dei_LegalEntityAxis = rdi_ShadowViewLandAndFarmingLlcMember
Sutton Hill Properties [Member] |  |
Noncontrolling Interest [Line Items] |  |
Noncontrolling interests in consolidated subsidiaries | $ 2,180 rdi_NoncontrollingInterestsInConsolidatedSubsidiaries / dei_LegalEntityAxis = rdi_SuttonHillPropertiesMember | $ 2,202 rdi_NoncontrollingInterestsInConsolidatedSubsidiaries / dei_LegalEntityAxis = rdi_SuttonHillPropertiesMember

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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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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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: |