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v2.4.1.9

11. INCOME TAXES (Details - Effective tax rates) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Federal tax | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State franchise tax, net of federal benefit | (3.64%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | (14.20%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 17.49%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other Non deductible expenses | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense | 0.07%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense | (2.42%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Meals and entertainment | 4.85%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment | 1.98%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment | 2.22%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment
Noncontrolling interest in partnerships | (2.88%)rdnt_EffectiveIncomeTaxRateReconciliationNoncontrollingInterestInPartnerships | (1.48%)rdnt_EffectiveIncomeTaxRateReconciliationNoncontrollingInterestInPartnerships | 1.79%rdnt_EffectiveIncomeTaxRateReconciliationNoncontrollingInterestInPartnerships
Equity compensation | (8.72%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | 35.39%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | 10.69%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Changes in valuation allowance | 24.52%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (17.88%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (1284.18%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Return-to-provision | (9.57%)rdnt_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseReturnToProvision | (1.96%)rdnt_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseReturnToProvision | (47.80%)rdnt_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseReturnToProvision
Deferred tru-ups and other | 16.34%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Uncertain tax positions | (3.67%)rdnt_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseUncertainTaxPositions | (2.92%)rdnt_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseUncertainTaxPositions | 6.45%rdnt_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseUncertainTaxPositions
Expiring net operating losses | 2.61%rdnt_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExpiringNetOperatingLosses | 26.64%rdnt_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExpiringNetOperatingLosses | 0.00%rdnt_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExpiringNetOperatingLosses
Income tax expense (benefit) | 53.85%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 59.64%us-gaap_EffectiveIncomeTaxRateContinuingOperations | (1261.76%)us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to return-to-provision + References No definition available. + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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