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Commitments And Contingencies (Details) |  |  |  |  | 0 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2014 Rialto Distribution [Member] USD ($) | Dec. 31, 2014 Rialto Distribution [Member] NZD | Dec. 31, 2013 Rialto Distribution [Member] USD ($) | Dec. 31, 2013 Rialto Distribution [Member] NZD | Oct. 26, 2011 IRS [Member] USD ($) | Jan. 06, 2011 IRS [Member] USD ($) | Dec. 31, 2014 IRS [Member] USD ($) | Dec. 31, 2013 IRS [Member] USD ($) | Dec. 31, 2014 State [Member] USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment |  |  | 33.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 33.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember |  |  |  |  |  |  |
Line of credit facility |  |  | $ 1,600,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 2,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | $ 1,600,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 2,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember |  |  |  |  |
Line of credit facility, amount outstanding |  |  | 592,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 760,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 634,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 770,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember |  |  |  |  |
Percentage of claim adjustment conceded to income |  |  |  |  |  |  |  | 70.00%rdi_PercentageOfClaimAdjustmentConcededToIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
Unpaid tax of wholly owned subsidiary |  |  |  |  |  |  |  | 20,900,000 rdi_UnpaidTaxOfWhollyOwnedSubsidiary / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
Income tax obligation |  |  |  |  |  |  |  | 5,400,000 rdi_IncomeTaxExaminationIncomeTaxObligation / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
Reduction of income tax obligation, income tax refund |  |  |  |  |  |  |  | 800,000 rdi_IncomeTaxExaminationReductionOfIncomeTaxObligation / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
Increase in income tax obligation, interest expense |  |  |  |  |  |  |  | 9,300,000 us-gaap_IncomeTaxExaminationInterestExpense / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
Total federal tax liability |  |  |  |  |  |  |  | 13,900,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
Monthly income tax liability Payment |  |  |  |  |  |  | 290,000 rdi_MonthlyIncomeTaxLiabilityPayment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |  |
Period of monthly income tax liability payments |  |  |  |  |  |  | 5 years |  |  |  |
Taxes and interest payable | 5,300,000 rdi_TaxesAndInterestPayable | 8,300,000 rdi_TaxesAndInterestPayable |  |  |  |  |  |  |  |  |
Current taxes payable |  |  |  |  |  |  |  |  | 3,500,000 rdi_TaxesAndInterestPayableCurrent / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember | 3,500,000 rdi_TaxesAndInterestPayableCurrent / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |
Possible obligation |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember

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