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2. SUMMARY OF ACCOUNTING POLICIES (Details Narrative) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Allowance for bad debts | $ 15,100us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts | $ 12,700us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts |  |
Service Fee Revenue net of contractual allowances and discounts | 670,136us-gaap_HealthCareOrganizationPatientServiceRevenue | 665,307us-gaap_HealthCareOrganizationPatientServiceRevenue | 617,982us-gaap_HealthCareOrganizationPatientServiceRevenue |
Deferred revenue | 1,964us-gaap_DeferredRevenue | 1,344us-gaap_DeferredRevenue |  |
Software development costs capitalized | 6,400us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers |  |  |
Deferred financing costs, net of accumulated amortization | 6,700us-gaap_DeferredFinanceCostsNet | 10,000us-gaap_DeferredFinanceCostsNet |  |
Goodwill | 200,304us-gaap_Goodwill | 196,395us-gaap_Goodwill | 193,871us-gaap_Goodwill | 159,507us-gaap_Goodwill
Indefinite lived intangible assets | 7,508us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |  |  |
Loss development and open claims | 103us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | 123us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  |
Malpractice contingency liability | 1,000rdnt_MalpracticeContingencyLiability | 280rdnt_MalpracticeContingencyLiability |  |
Medical malpractice deductible accrual | 88rdnt_MedicalMalpracticeDeductibleAccrual | 95rdnt_MedicalMalpracticeDeductibleAccrual |  |
Contract loss accrual | 6,100rdnt_ContractLossAccrual | 6,400rdnt_ContractLossAccrual |  |
Lease commitment loss accrual | 218rdnt_LeaseCommitmentLossAccrual | 328rdnt_LeaseCommitmentLossAccrual |  |
Unfavorable contract liability | 1,200us-gaap_OffMarketLeaseUnfavorable | 2,100us-gaap_OffMarketLeaseUnfavorable |  |
Carrying value of line of credit | 15,300us-gaap_LineOfCredit | 0us-gaap_LineOfCredit |  |
Increase in investment in joint ventures | 3,200rdnt_IncreaseInInvestmentInJointVentures |  |  |
Management service fees | 9,300us-gaap_InvestmentAdvisoryManagementAndAdministrativeFees | 9,300us-gaap_InvestmentAdvisoryManagementAndAdministrativeFees | 8,500us-gaap_InvestmentAdvisoryManagementAndAdministrativeFees |
Garden State Radiology, LLC |  |  |  |
Equity interest acquired | 49.00%us-gaap_NoncashOrPartNoncashAcquisitionInterestAcquired1 / us-gaap_BusinessAcquisitionAxis = rdnt_GardenStateMember |  |  |
Payment for acquisition | 2,200us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = rdnt_GardenStateMember |  |  |
Options |  |  |  |
Shares excluded from diluted earnings per share calculation | 245,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember |  |  |
Warrants |  |  |  |
Shares excluded from diluted earnings per share calculation | 4,663,750us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember |  |  |
Restricted Stock |  |  |  |
Shares excluded from diluted earnings per share calculation | 3,825,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember |  |  |
Workers Compensation |  |  |  |
Self-insurance accrual | 529us-gaap_SelfInsuranceReserve / us-gaap_ReinsurancePolicyTypeAxis = rdnt_WorkersCompMember |  |  |
Health Insurance |  |  |  |
Self-insurance accrual | 2,000us-gaap_SelfInsuranceReserve / us-gaap_ReinsurancePolicyTypeAxis = rdnt_HealthInsuranceMember | 2,800us-gaap_SelfInsuranceReserve / us-gaap_ReinsurancePolicyTypeAxis = rdnt_HealthInsuranceMember |  |
eRAD |  |  |  |
Service Fee Revenue net of contractual allowances and discounts | 5,500us-gaap_HealthCareOrganizationPatientServiceRevenue / us-gaap_StatementBusinessSegmentsAxis = rdnt_ERADMember | 4,900us-gaap_HealthCareOrganizationPatientServiceRevenue / us-gaap_StatementBusinessSegmentsAxis = rdnt_ERADMember | 4,900us-gaap_HealthCareOrganizationPatientServiceRevenue / us-gaap_StatementBusinessSegmentsAxis = rdnt_ERADMember |
Deferred revenue | $ 1,900us-gaap_DeferredRevenue / us-gaap_StatementBusinessSegmentsAxis = rdnt_ERADMember |  |  |

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- Definition Amount of revenue from providing investment advisory, asset management and administrative services, including, but not limited to, distribution and shareholder services, accounting, tax, legal, regulatory filing, share registration, and shareholder correspondence activities. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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