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2. SUMMARY OF ACCOUNTING POLICIES (Details - Fair Value Measurements) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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FAIR VALUE MEASUREMENTS |  |
Senior Secured Term Loan |  | $ 349,125us-gaap_ShorttermDebtFairValue
Senior Notes |  | 200,000us-gaap_LongTermDebtFairValue
First Lien Term Loans | 399,750us-gaap_DebtInstrumentFairValue |
Second Lien Term Loans | 180,000rdnt_DebtInstrumentFairValue1 |
Level 1 |  |
FAIR VALUE MEASUREMENTS |  |
Senior Secured Term Loan |  | 0us-gaap_ShorttermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Senior Notes |  | 0us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
First Lien Term Loans | 0us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Second Lien Term Loans | 0rdnt_DebtInstrumentFairValue1 / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Level 2 |  |
FAIR VALUE MEASUREMENTS |  |
Senior Secured Term Loan |  | 380,508us-gaap_ShorttermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Senior Notes |  | 199,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
First Lien Term Loans | 394,753us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Second Lien Term Loans | 178,200rdnt_DebtInstrumentFairValue1 / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Level 3 |  |
FAIR VALUE MEASUREMENTS |  |
Senior Secured Term Loan |  | 0us-gaap_ShorttermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Senior Notes |  | 0us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
First Lien Term Loans | 0us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Second Lien Term Loans | 0rdnt_DebtInstrumentFairValue1 / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Total Fair Value |  |
FAIR VALUE MEASUREMENTS |  |
Senior Secured Term Loan |  | 380,508us-gaap_ShorttermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = rdnt_TotalFairValueMember
Senior Notes |  | 199,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = rdnt_TotalFairValueMember
First Lien Term Loans | 394,753us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = rdnt_TotalFairValueMember |
Second Lien Term Loans | $ 178,200rdnt_DebtInstrumentFairValue1 / us-gaap_FairValueByFairValueHierarchyLevelAxis = rdnt_TotalFairValueMember |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References No definition available. + Details
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Namespace Prefix: | rdnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
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