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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 |  | $ 16,835,000 us-gaap_DeferredTaxAssetsValuationAllowance | $ 34,022,000 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  |  |
Net deferred tax asset |  | 22,267,000 us-gaap_DeferredTaxAssetsNet | 8,839,000 us-gaap_DeferredTaxAssetsNet |  |  |  |  |
Net deferred tax asset, current |  | 6,300,000 us-gaap_DeferredTaxAssetsNetCurrent | 3,273,000 us-gaap_DeferredTaxAssetsNetCurrent |  |  |  |  |
Net deferred tax asset, noncurrent |  | 15,967,000 us-gaap_DeferredTaxAssetsNetNoncurrent | 5,566,000 us-gaap_DeferredTaxAssetsNetNoncurrent |  |  |  |  |
Net operating loss carry forwards |  | 700,000 us-gaap_OperatingLossCarryforwards |  |  |  |  |  |
Alternative minimum tax carry forwards |  | 3,546,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 3,291,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax |  |  |  |  |
Accrued income taxes |  | 16,000,000 us-gaap_AccruedIncomeTaxes |  |  |  |  |  |
Accrued income taxes, current |  | 6,000,000 us-gaap_AccruedIncomeTaxesCurrent |  |  |  |  |  |
Non-current tax liabilities |  | 10,000,000 us-gaap_AccruedIncomeTaxesNoncurrent |  |  |  |  |  |
Income taxes paid |  | 6,407,000 us-gaap_IncomeTaxesPaid | 5,903,000 us-gaap_IncomeTaxesPaid | 5,666,000 us-gaap_IncomeTaxesPaid |  |  |  |
Accrued income taxes, current judgment |  | 3,500,000 rdi_AccruedIncomeTaxesCurrentJudgment |  |  |  |  |  |
Accrued income taxes, noncurrent judgment |  | 8,800,000 rdi_AccruedIncomeTaxesNoncurrentJudgment |  |  |  |  |  |
Gross tax benefits | 11,400,000 us-gaap_UnrecognizedTaxBenefits | 3,760,000 us-gaap_UnrecognizedTaxBenefits | 2,160,000 us-gaap_UnrecognizedTaxBenefits | 2,171,000 us-gaap_UnrecognizedTaxBenefits | 2,171,000 us-gaap_UnrecognizedTaxBenefits | 1,974,000 us-gaap_UnrecognizedTaxBenefits | 11,400,000 us-gaap_UnrecognizedTaxBenefits | 10,800,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax interest |  | 5,400,000 rdi_UnrecognizedIncomeTaxInterestExpense | 1,800,000 rdi_UnrecognizedIncomeTaxInterestExpense | 3,200,000 rdi_UnrecognizedIncomeTaxInterestExpense |  |  |  | 1,700,000 rdi_UnrecognizedIncomeTaxInterestExpense
Unrecognized Tax Benefits Tax | 2,300,000 rdi_UnrecognizedTaxBenefitsTax | 3,700,000 rdi_UnrecognizedTaxBenefitsTax |  | 2,100,000 rdi_UnrecognizedTaxBenefitsTax |  |  |  |
Increase (decrease) to unrecognized tax benefits |  | 1,600,000 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease | 2,100,000 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease | 200,000 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |  |  |  |
Increase (decrease) to unrecognized tax interest |  | 3,600,000 rdi_UnrecognizedIncomeTaxInterestExpensePeriodIncreaseDecrease | 1,400,000 rdi_UnrecognizedIncomeTaxInterestExpensePeriodIncreaseDecrease | 1,100,000 rdi_UnrecognizedIncomeTaxInterestExpensePeriodIncreaseDecrease |  |  |  |
Unrecognized tax benefits and interest |  | 9,200,000 rdi_UnrecognizedTaxBenefitsAndUnrecognizedIncomeTaxInterestExpense | 3,900,000 rdi_UnrecognizedTaxBenefitsAndUnrecognizedIncomeTaxInterestExpense | 5,300,000 rdi_UnrecognizedTaxBenefitsAndUnrecognizedIncomeTaxInterestExpense |  |  |  |
Unrecognized tax benefits that would impact of effective tax rate if recognized |  | 8,100,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 2,900,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 4,300,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |  |
Uncertain tax position probable changes in next 12 months, maximum |  | 1,500,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound |  |  |  |  |  |
Unrecognized Tax Benefits | 11,400,000 us-gaap_UnrecognizedTaxBenefits | 3,760,000 us-gaap_UnrecognizedTaxBenefits | 2,160,000 us-gaap_UnrecognizedTaxBenefits | 2,171,000 us-gaap_UnrecognizedTaxBenefits | 2,171,000 us-gaap_UnrecognizedTaxBenefits | 1,974,000 us-gaap_UnrecognizedTaxBenefits | 11,400,000 us-gaap_UnrecognizedTaxBenefits | 10,800,000 us-gaap_UnrecognizedTaxBenefits
Australia [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Net operating loss carry forwards |  | 3,800,000 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_AU |  |  |  |  |  |
New Zealand [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Net operating loss carry forwards |  | 11,300,000 us-gaap_OperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = country_NZ |  |  |  |  |  |
Puerto Rico [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Net operating loss carry forwards |  | $ 14,100,000 us-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 |  |  |  |  |  |

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