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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 1,685us-gaap_ProfitLoss $ 2,376us-gaap_ProfitLoss $ 59,604us-gaap_ProfitLoss
Depreciation and amortization 59,258us-gaap_DepreciationDepletionAndAmortization 58,890us-gaap_DepreciationDepletionAndAmortization 57,740us-gaap_DepreciationDepletionAndAmortization
Provision for bad debts 29,807us-gaap_ProvisionForDoubtfulAccounts 27,911us-gaap_ProvisionForDoubtfulAccounts 25,904us-gaap_ProvisionForDoubtfulAccounts
Equity in earnings of joint ventures (6,970)us-gaap_IncomeLossFromEquityMethodInvestments (6,194)us-gaap_IncomeLossFromEquityMethodInvestments (6,476)us-gaap_IncomeLossFromEquityMethodInvestments
Distributions from joint ventures 7,358us-gaap_EquityMethodInvestmentDividendsOrDistributions 7,204us-gaap_EquityMethodInvestmentDividendsOrDistributions 6,477us-gaap_EquityMethodInvestmentDividendsOrDistributions
Deferred rent amortization 2,180rdnt_DeferredRentAmortization 3,871rdnt_DeferredRentAmortization 3,608rdnt_DeferredRentAmortization
Amortization and write off of deferred financing costs and loan discount 5,732us-gaap_AmortizationOfFinancingCosts 4,565us-gaap_AmortizationOfFinancingCosts 3,637us-gaap_AmortizationOfFinancingCosts
Loss on sale and disposal of equipment 1,113us-gaap_GainLossOnSaleOfPropertyPlantEquipment 1,032us-gaap_GainLossOnSaleOfPropertyPlantEquipment 456us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Gain on bargain purchase 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount (810)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
Loss on early extinguishment of Senior Notes 15,927us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt
Gain on sale of imaging centers and de-consolidation of joint venture 0rdnt_GainOnSaleOfImagingCentersAndDeconsolidationOfJointVenture (2,108)rdnt_GainOnSaleOfImagingCentersAndDeconsolidationOfJointVenture (2,777)rdnt_GainOnSaleOfImagingCentersAndDeconsolidationOfJointVenture
Amortization of cash flow hedge 0us-gaap_AmortizationOfDeferredHedgeGains 0us-gaap_AmortizationOfDeferredHedgeGains 918us-gaap_AmortizationOfDeferredHedgeGains
Stock-based compensation 2,500us-gaap_ShareBasedCompensation 2,574us-gaap_ShareBasedCompensation 2,736us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:      
Accounts receivable (43,973)us-gaap_IncreaseDecreaseInAccountsReceivable (31,531)us-gaap_IncreaseDecreaseInAccountsReceivable (17,350)us-gaap_IncreaseDecreaseInAccountsReceivable
Other current assets (5,514)us-gaap_IncreaseDecreaseInOtherOperatingAssets (2,243)us-gaap_IncreaseDecreaseInOtherOperatingAssets 3,565us-gaap_IncreaseDecreaseInOtherOperatingAssets
Other assets (281)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 260us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (578)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Deferred taxes 655us-gaap_DeferredOtherTaxExpenseBenefit 2,907us-gaap_DeferredOtherTaxExpenseBenefit (56,142)us-gaap_DeferredOtherTaxExpenseBenefit
Deferred revenue 620us-gaap_IncreaseDecreaseInDeferredRevenue 71us-gaap_IncreaseDecreaseInDeferredRevenue 197us-gaap_IncreaseDecreaseInDeferredRevenue
Accounts payable and accrued expenses and other (9,093)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (3,163)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (5,440)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Net cash provided by operating activities 61,004us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 66,422us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 75,269us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of imaging facilities (9,428)us-gaap_PaymentsToAcquireProductiveAssets (7,223)us-gaap_PaymentsToAcquireProductiveAssets (45,493)us-gaap_PaymentsToAcquireProductiveAssets
Purchase of property and equipment (41,740)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (48,623)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (44,448)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of equipment 1,088us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 635us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 1,549us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Proceeds from sale of imaging facilities 0us-gaap_ProceedsFromSaleOfProductiveAssets 3,920us-gaap_ProceedsFromSaleOfProductiveAssets 2,300us-gaap_ProceedsFromSaleOfProductiveAssets
Proceeds from sale of joint venture interests 0us-gaap_ProceedsFromDivestitureOfInterestInJointVenture 2,640us-gaap_ProceedsFromDivestitureOfInterestInJointVenture 1,800us-gaap_ProceedsFromDivestitureOfInterestInJointVenture
Equity contributions in existing and purchase of interest in joint ventures (3,562)us-gaap_PaymentsToAcquireInvestments (2,009)us-gaap_PaymentsToAcquireInvestments (2,756)us-gaap_PaymentsToAcquireInvestments
Net cash used in investing activities (53,642)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (50,660)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (87,048)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES      
Principal payments on notes and leases payable (23,913)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities (9,764)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities (22,223)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
Proceeds from borrowings 210,000us-gaap_ProceedsFromIssuanceOfDebt 35,122us-gaap_ProceedsFromIssuanceOfDebt 344,485us-gaap_ProceedsFromIssuanceOfDebt
Payments on Senior Notes (211,344)us-gaap_RepaymentsOfDebt 0us-gaap_RepaymentsOfDebt (277,875)us-gaap_RepaymentsOfDebt
Deferred financing costs (6,650)us-gaap_DeferredFinanceCostsOwnshareLendingArrangementIssuanceCostsAdjustment (432)us-gaap_DeferredFinanceCostsOwnshareLendingArrangementIssuanceCostsAdjustment (3,753)us-gaap_DeferredFinanceCostsOwnshareLendingArrangementIssuanceCostsAdjustment
Net proceeds (payments) on revolving credit facility 15,300us-gaap_ProceedsFromLinesOfCredit (33,000)us-gaap_ProceedsFromLinesOfCredit (25,000)us-gaap_ProceedsFromLinesOfCredit
Payments on interest rate swaps, net of amounts received 0rdnt_PaymentsToCounterpartiesOfInterestRateSwapsNetOfAmountsReceived 0rdnt_PaymentsToCounterpartiesOfInterestRateSwapsNetOfAmountsReceived (5,823)rdnt_PaymentsToCounterpartiesOfInterestRateSwapsNetOfAmountsReceived
Dividends paid to noncontrolling interests (148)us-gaap_PaymentsToMinorityShareholders (18)us-gaap_PaymentsToMinorityShareholders (71)us-gaap_PaymentsToMinorityShareholders
Equity attributable to non-controlling interests 0us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest 0us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest (117)us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest
Purchase on non-controlling interests (196)us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries 0us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries 0us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
Proceeds from issuance of common stock upon exercise of options/warrants 1,546rdnt_ProceedsFromIssuanceOfCommonStockUponExerciseOfOptionswarrants 469rdnt_ProceedsFromIssuanceOfCommonStockUponExerciseOfOptionswarrants 0rdnt_ProceedsFromIssuanceOfCommonStockUponExerciseOfOptionswarrants
Net cash (used in) provided by financing activities (15,405)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (7,623)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 9,623us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
EFFECT OF EXCHANGE RATE CHANGES ON CASH (62)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (89)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 63us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (8,105)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 8,050us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (2,093)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS, beginning of period 8,412us-gaap_CashAndCashEquivalentsAtCarryingValue 362us-gaap_CashAndCashEquivalentsAtCarryingValue 2,455us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS, end of period 307us-gaap_CashAndCashEquivalentsAtCarryingValue 8,412us-gaap_CashAndCashEquivalentsAtCarryingValue 362us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION      
Cash paid during the period for interest 41,584us-gaap_InterestPaid 41,841us-gaap_InterestPaid 47,806us-gaap_InterestPaid
Cash paid during the period for income taxes 1,070us-gaap_IncomeTaxesPaidNet 1,142us-gaap_IncomeTaxesPaidNet 918us-gaap_IncomeTaxesPaidNet
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES      
Purchase of equipment and leasehold improvements not yet paid for 19,400rdnt_PurchaseOfEquipmentAndLeaseholdImprovementsNotYetPaidFor 16,700rdnt_PurchaseOfEquipmentAndLeaseholdImprovementsNotYetPaidFor 14,400rdnt_PurchaseOfEquipmentAndLeaseholdImprovementsNotYetPaidFor
Capital lease debt related to radiology equipment $ 12,600rdnt_CapitalLeaseDebtRelatedToRadiologyEquipment