XML 95 R58.htm IDEA: XBRL DOCUMENT
v3.21.1

Summary Of Significant Accounting Policies (Schedule Of Estimated Useful Lives Of Assets) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020
Building And Improvements [Member] | Minimum [Member] |
Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life | 15 years
Building And Improvements [Member] | Maximum [Member] |
Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life | 60 years
Theater Equipment [Member] |
Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life | 7 years
Furniture And Fixtures [Member] | Minimum [Member] |
Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life | 3 years
Furniture And Fixtures [Member] | Maximum [Member] |
Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life | 10 years

X
- Definition Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
Name: | rdi_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | rdi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |