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11. INCOME TAXES (Details - Deferred tax assets and liabilities) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Disclosure [Abstract] |  |
Net operating losses | $ 87,709us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 82,630us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accrued expenses | 3,594us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 3,610us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Straight-Line Rent Adjustment | 8,897rdnt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRentAdjustment | 8,053rdnt_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRentAdjustment
Unfavorable contract liability | 2,811us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 3,365us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Equity compensation | 253us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | 645us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Allowance for doubtful accounts | 2,124us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | 2,494us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Other | 1,891us-gaap_DeferredTaxAssetsOther | 1,400us-gaap_DeferredTaxAssetsOther
Valuation allowance | (6,378)us-gaap_DeferredTaxAssetsValuationAllowance | (6,593)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets | 100,901us-gaap_DeferredTaxAssetsGross | 95,604us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities: |  |
Property & equipment | (7,755)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (7,948)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Goodwill | (17,833)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill | (15,101)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill
Intangibles | (12,105)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets | (12,162)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
NAEM Reserve | (6,441)us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts | (555)us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts
Other | (4,189)us-gaap_DeferredTaxLiabilitiesOther | (1,603)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities | (48,323)us-gaap_DeferredTaxLiabilities | (42,369)us-gaap_DeferredTaxLiabilities
Net Deferred Tax Asset | $ 52,578us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 53,235us-gaap_DeferredTaxAssetsLiabilitiesNet

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