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Other Liabilities (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Aug. 29, 2014
Other Liabilities [Line Items]        
Accrued pension costs $ 6,614,000us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent   $ 6,740,000us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent $ 7,500,000us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
Service costs recognized 0us-gaap_DefinedBenefitPlanServiceCost 0us-gaap_DefinedBenefitPlanServiceCost    
Interest cost 45,000us-gaap_DefinedBenefitPlanInterestCost 82,000us-gaap_DefinedBenefitPlanInterestCost    
Amortized actuarial gain (loss) (52,000)us-gaap_DefinedBenefitPlanActuarialGainLoss      
Present value of liability 10,300,000us-gaap_DefinedBenefitPlanBenefitObligation (236,000)us-gaap_DefinedBenefitPlanBenefitObligation    
Discounted rate 4.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate      
Discount term 15 years      
Monthly estate payment amount 56,944rdi_DefinedBenefitPlanMonthlyEstatePaymentAmount      
Discounted value 2,800,000rdi_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountAmount      
Accumulated prior service cost 3,100,000rdi_DefinedBenefitPlanAccumulatedAmortizationOfPriorServiceCostCredit      
Accumulated prior service cost amortization period 15 years      
Accrued pension costs included in other liabilities 7,600,000us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities      
Supplemental Executive Retirement Plan [Member]        
Other Liabilities [Line Items]        
Accrued pension costs       $ 7,600,000us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember