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Notes Payable (Australian Shopping Center Loans) (Narrative) (Details) (Australian Shopping Center Loans [Member]) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2004 USD ($) loan | Jul. 31, 2004 AUD | Dec. 31, 2014 USD ($) | Dec. 31, 2014 AUD
Debt Instrument [Line Items] |  |  |  |
Number of loans assumed | 3 rdi_NumberOfLoansAssumed / us-gaap_DebtInstrumentAxis = rdi_AustralianShoppingCenterLoansMember | 3 rdi_NumberOfLoansAssumed / us-gaap_DebtInstrumentAxis = rdi_AustralianShoppingCenterLoansMember |  |
Total amount of loans assumed | $ 1,500,000 us-gaap_LoansAssumed1 / us-gaap_DebtInstrumentAxis = rdi_AustralianShoppingCenterLoansMember | 2,100,000 us-gaap_LoansAssumed1 / us-gaap_DebtInstrumentAxis = rdi_AustralianShoppingCenterLoansMember |  |
Interest rate |  |  | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = rdi_AustralianShoppingCenterLoansMember | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = rdi_AustralianShoppingCenterLoansMember
Annual principal payment |  |  | $ 82,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = rdi_AustralianShoppingCenterLoansMember | 100,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = rdi_AustralianShoppingCenterLoansMember

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- Definition Number Of Loans Assumed + References No definition available. + Details
Name: | rdi_NumberOfLoansAssumed
Namespace Prefix: | rdi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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Balance Type: | na
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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The fair value of loans assumed in noncash investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
Name: | us-gaap_LoansAssumed1
Namespace Prefix: | us-gaap_
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