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4us-gaap_DerivativeVariableInterestRateus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00falsefalsefalse4falsetruefalse00falsefalsefalse5falsetruefalse00falsefalsefalse6falsetruefalse00falsefalsefalse7falsetruefalse00falsefalsefalse8falsetruefalse00falsefalsefalse9truetruefalse0.030.03falsefalsefalse10falsetruefalse00falsefalsefalse11truetruefalse0.020.02falsefalsefalse12falsetruefalse00falsefalsefalse13falsetruefalse00falsefalsefalse14falsetruefalse00falsefalsefalse15falsetruefalse00falsefalsefalse16falsetruefalse00falsefalsefalse17falsetruefalse00falsefalsefalse18falsetruefalse00falsefalsefalsenum:percentItemTypepureVariable interest rate in effect as of the balance sheet date related to the interest rate derivative.No definition available.false0Underlying debt interest rate (percent)14false 4us-gaap_DerivativeBasisSpreadOnVariableRateus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00falsefalsefalse4falsetruefalse00falsefalsefalse5falsetruefalse00falsefalsefalse6truetruefalse0.020.02falsefalsefalse7truetruefalse0.0250.025falsefalsefalse8falsetruefalse00falsefalsefalse9falsetruefalse00falsefalsefalse10falsetruefalse00falsefalsefalse11falsetruefalse00falsefalsefalse12falsetruefalse00falsefalsefalse13falsetruefalse00falsefalsefalse14falsetruefalse00falsefalsefalse15truetruefalse0.0250.025falsefalsefalse16truetruefalse0.020.02falsefalsefalse17falsetruefalse00falsefalsefalse18falsetruefalse00falsefalsefalsenum:percentItemTypepureThe percentage points added to the reference rate to compute the variable rate on the interest rate derivative.No definition available.false0Interest rate agreement, basis spread on variable rate (percent)falseDerivatives (Textual) (Details) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://alliancehealthcareservices-us.com/role/DerivativesTextualDetails1814