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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 3rdi_NumberOfLoansAssumed
/ us-gaap_DebtInstrumentAxis
= rdi_AustralianShoppingCenterLoansMember
3rdi_NumberOfLoansAssumed
/ us-gaap_DebtInstrumentAxis
= rdi_AustralianShoppingCenterLoansMember
   
Total amount of loans assumed $ 1,500,000us-gaap_LoansAssumed1
/ us-gaap_DebtInstrumentAxis
= rdi_AustralianShoppingCenterLoansMember
2,100,000us-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     $ 82,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= rdi_AustralianShoppingCenterLoansMember
100,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= rdi_AustralianShoppingCenterLoansMember