XML 58 R46.htm IDEA: XBRL DOCUMENT
v3.19.2

Summary Of Significant Accounting Policies (Narrative) (Details) | 6 Months Ended
--- | ---
Jun. 30, 2018 USD ($)
Description Of Business And Segment Reporting [Abstract] |
Prior period immaterial error amount | $ 440,000

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

X
- 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