Debt Instrument Contractual Facility Borrowing Capacity

No definition available.

Name:	rdi_DebtInstrumentContractualFacilityBorrowingCapacity
Namespace Prefix:	rdi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line Of Credit Extension Period

+ References

No definition available.

+ Details

Name:	rdi_LineOfCreditExtensionPeriod
Namespace Prefix:	rdi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit, Number Of Extension Options

+ References

No definition available.

+ Details

Name:	rdi_LineOfCreditNumberOfExtensionOptions
Namespace Prefix:	rdi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_OwnershipAxis=rdi_SuttonHillPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rdi_UnitedStateCinemasOneTwoThreeTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Cinema 1, 2, 3 Term Loan) (Narrative) (Details) $ in Thousands			9 Months Ended	12 Months Ended
	Mar. 13, 2020 USD ($)	Mar. 12, 2020 USD ($)	Sep. 30, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Contractual facility			$ 289,876	$ 283,138
Sutton Hill Properties, LLC [Member]
Debt Instrument [Line Items]
Ownership percentage by parent			75.00%
US Cinema 1, 2, 3 Term Loan [Member]
Debt Instrument [Line Items]
Contractual facility	$ 25,000	$ 20,000	$ 24,768	$ 18,658
Interest rate	4.25%
Number of extension options \| item			2
Extension period			6 months
Maturity date	Apr. 01, 2022		Apr. 01, 2022	Apr. 01, 2022