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11. INCOME TAXES (Details - Effective tax rates)	12 Months Ended
	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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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 nontcontrolling interest in partnerships

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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 expiring net operating losses.

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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

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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.

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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 other nondeductible expenses.

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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 equity-based compensation costs.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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