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Income Taxes (Narrative) (Details) (USD $)
 0 Months Ended 12 Months Ended
Dec. 31, 2007
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2007
Jan. 01, 2007
Income Tax Disclosure [Line Items]                
Valuation allowance   $ 16,835,000us-gaap_DeferredTaxAssetsValuationAllowance $ 34,022,000us-gaap_DeferredTaxAssetsValuationAllowance          
Net deferred tax asset   22,267,000us-gaap_DeferredTaxAssetsNet 8,839,000us-gaap_DeferredTaxAssetsNet          
Net deferred tax asset, current   6,300,000us-gaap_DeferredTaxAssetsNetCurrent 3,273,000us-gaap_DeferredTaxAssetsNetCurrent          
Net deferred tax asset, noncurrent   15,967,000us-gaap_DeferredTaxAssetsNetNoncurrent 5,566,000us-gaap_DeferredTaxAssetsNetNoncurrent          
Net operating loss carry forwards   700,000us-gaap_OperatingLossCarryforwards            
Alternative minimum tax carry forwards   3,546,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 3,291,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax          
Accrued income taxes   16,000,000us-gaap_AccruedIncomeTaxes            
Accrued income taxes, current   6,000,000us-gaap_AccruedIncomeTaxesCurrent            
Non-current tax liabilities   10,000,000us-gaap_AccruedIncomeTaxesNoncurrent            
Income taxes paid   6,407,000us-gaap_IncomeTaxesPaid 5,903,000us-gaap_IncomeTaxesPaid 5,666,000us-gaap_IncomeTaxesPaid        
Accrued income taxes, current judgment   3,500,000rdi_AccruedIncomeTaxesCurrentJudgment            
Accrued income taxes, noncurrent judgment   8,800,000rdi_AccruedIncomeTaxesNoncurrentJudgment            
Gross tax benefits 11,400,000us-gaap_UnrecognizedTaxBenefits 3,760,000us-gaap_UnrecognizedTaxBenefits 2,160,000us-gaap_UnrecognizedTaxBenefits 2,171,000us-gaap_UnrecognizedTaxBenefits 2,171,000us-gaap_UnrecognizedTaxBenefits 1,974,000us-gaap_UnrecognizedTaxBenefits 11,400,000us-gaap_UnrecognizedTaxBenefits 10,800,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax interest   5,400,000rdi_UnrecognizedIncomeTaxInterestExpense 1,800,000rdi_UnrecognizedIncomeTaxInterestExpense 3,200,000rdi_UnrecognizedIncomeTaxInterestExpense       1,700,000rdi_UnrecognizedIncomeTaxInterestExpense
Unrecognized Tax Benefits Tax 2,300,000rdi_UnrecognizedTaxBenefitsTax 3,700,000rdi_UnrecognizedTaxBenefitsTax   2,100,000rdi_UnrecognizedTaxBenefitsTax        
Increase (decrease) to unrecognized tax benefits   1,600,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease 2,100,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease 200,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease        
Increase (decrease) to unrecognized tax interest   3,600,000rdi_UnrecognizedIncomeTaxInterestExpensePeriodIncreaseDecrease 1,400,000rdi_UnrecognizedIncomeTaxInterestExpensePeriodIncreaseDecrease 1,100,000rdi_UnrecognizedIncomeTaxInterestExpensePeriodIncreaseDecrease        
Unrecognized tax benefits and interest   9,200,000rdi_UnrecognizedTaxBenefitsAndUnrecognizedIncomeTaxInterestExpense 3,900,000rdi_UnrecognizedTaxBenefitsAndUnrecognizedIncomeTaxInterestExpense 5,300,000rdi_UnrecognizedTaxBenefitsAndUnrecognizedIncomeTaxInterestExpense        
Unrecognized tax benefits that would impact of effective tax rate if recognized   8,100,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 2,900,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 4,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate        
Uncertain tax position probable changes in next 12 months, maximum   1,500,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound            
Unrecognized Tax Benefits 11,400,000us-gaap_UnrecognizedTaxBenefits 3,760,000us-gaap_UnrecognizedTaxBenefits 2,160,000us-gaap_UnrecognizedTaxBenefits 2,171,000us-gaap_UnrecognizedTaxBenefits 2,171,000us-gaap_UnrecognizedTaxBenefits 1,974,000us-gaap_UnrecognizedTaxBenefits 11,400,000us-gaap_UnrecognizedTaxBenefits 10,800,000us-gaap_UnrecognizedTaxBenefits
Australia [Member]                
Income Tax Disclosure [Line Items]                
Net operating loss carry forwards   3,800,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= country_AU		            
New Zealand [Member]                
Income Tax Disclosure [Line Items]                
Net operating loss carry forwards   11,300,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= country_NZ		            
Puerto Rico [Member]                
Income Tax Disclosure [Line Items]                
Net operating loss carry forwards   $ 14,100,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= country_PR		            
Minimum [Member]                
Income Tax Disclosure [Line Items]                
Ownership percentage   20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Maximum [Member]                
Income Tax Disclosure [Line Items]                
Ownership percentage   50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember