XML 57 R46.htm IDEA: XBRL DOCUMENT
v3.22.1

Operations In Foreign Currency (Summary Of Currency Exchange Rates) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Australian Dollar [Member] | Spot Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.7499 | 0.7613 | 0.7260
Australian Dollar [Member] | Average Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.7241 | 0.7730 | 0.7517
New Zealand Dollar [Member] | Spot Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.6946 | 0.6989 | 0.6839
New Zealand Dollar [Member] | Average Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.6763 | 0.7194 | 0.7077

X
- Definition Currency Exchange Rates [Line Items] + References No definition available. + Details
Name: | rdi_CurrencyExchangeRatesLineItems
Namespace Prefix: | rdi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Foreign Currency Exchange Rate + References No definition available. + Details
Name: | rdi_ForeignCurrencyExchangeRate
Namespace Prefix: | rdi_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CurrencyAxis=currency_AUD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=rdi_SpotRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=rdi_AverageRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_NZD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |