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Notes Payable (Trust Preferred Securities) (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 28, 2013
May 01, 2012
Apr. 30, 2009
Dec. 31, 2008
Feb. 05, 2007
Dec. 31, 2011
Dec. 31, 2009
Dec. 31, 2008
Mar. 31, 2009
Debt Instrument [Line Items]                        
Trust preferred securities issued               $ 51,500,000rdi_TrustPreferredSecuritiesIssuedBySubsidiaryValue        
Trust preferred securities issued to third party               50,000,000rdi_TrustPreferredSecuritiesIssuedBySubsidiaryToUnrelatedThirdPartyValue        
Trust preferred securities issued to parent               1,500,000rdi_TrustPreferredSecuritiesIssuedBySubsidiaryToParentValue        
Interest rate swap 2,177,000us-gaap_DerivativeLiabilitiesNoncurrent 3,288,000us-gaap_DerivativeLiabilitiesNoncurrent                    
Investment in common trust securities 838,000rdi_InvestmentInInternalTrust 838,000rdi_InvestmentInInternalTrust           1,500,000rdi_InvestmentInInternalTrust        
Trust preferred dividends paid 1,400,000rdi_TrustPreferredDividendsPaid 1,200,000rdi_TrustPreferredDividendsPaid 1,900,000rdi_TrustPreferredDividendsPaid                  
Preferred stock dividends payable 194,000us-gaap_DividendsPayableCurrentAndNoncurrent 191,000us-gaap_DividendsPayableCurrentAndNoncurrent                    
Marketable securities                       11,500,000us-gaap_MarketableSecurities
Trust Preferred Securities [Member]                        
Debt Instrument [Line Items]                        
Trust preferred securities               51,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		       22,900,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember
Debt instrument term               20 years        
Initial interest rate         9.22%rdi_DebtInstrumentInitialInterestRate
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		              
Period of initial interest rate         5 years              
LIBOR period         3 months              
Spread over LIBOR         4.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		              
Interest rate swap       27,900,000us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		                
Fixed interest rate 5.20%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		                      
Swap contract rate 1.20%rdi_DerivativeFixedInterestRateContractRate
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		     1.20%rdi_DerivativeFixedInterestRateContractRate
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		                
Fixed interest rate margin 4.00%rdi_DerivativeFixedInterestRateMargin
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		     4.00%rdi_DerivativeFixedInterestRateMargin
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		                
Maturity date Apr. 30, 2027                      
Principal payment 0us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		                      
Initial period of payoff restriction 5 years                      
Percentage of principal that may be paid without penalty after initial restriction period 100.00%rdi_DebtCovenantsPercentageOfPrincipalThatMayBePaidWithoutPenaltyAfterInitialRestrictionPeriod
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		                      
Period of waiver on all financial covenants                     9 years  
Financial covenant waiver payment due 270,000rdi_FinancialCovenantWaiverPaymentPayable
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		           1,600,000rdi_FinancialCovenantWaiverPaymentPayable
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		       1,600,000rdi_FinancialCovenantWaiverPaymentPayable
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		  
Financial covenant waiver payment             1,100,000rdi_FinancialCovenantWaiverPayment
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		   270,000rdi_FinancialCovenantWaiverPayment
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		      
Frequency of interest payment 3 months                      
Extinguishment of debt           22,900,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		            
Amortization of debt discount                   106,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		    
Gain on retirement of subordinated debt           10,700,000us-gaap_ExtinguishmentOfDebtGainLossNetOfTax
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember		            
Write-off of deferred loan costs           $ 749,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_DebtInstrumentAxis
= rdi_TrustPreferredSecuritiesMember