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Investments In Unconsolidated Joint Ventures (Narrative) (Details) - 6 months ended Jun. 30, 2017 | NZD | USD ($)
--- | --- | ---
Rialto Distribution [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Gain on sale of investment | NZD 21,000 | $ 15,000

X
- Definition The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
Name: | us-gaap_GainOnSaleOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=rdi_RialtoDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |