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v3.19.1

Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($)
Description Of Business And Segment Reporting [Abstract] |
Prior period immaterial error amount | $ 440

X
- Definition The disclosure of the nature of an entity's business and the reporting segments. + References No definition available. + Details
Name: | rdi_DescriptionOfBusinessAndSegmentReportingAbstract
Namespace Prefix: | rdi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Prior Period Immaterial Error + References No definition available. + Details
Name: | rdi_PriorPeriodImmaterialError
Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration