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Discontinued Operations, Exit Activities, and Clinic Obligations - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accrued Liabilities	$ 6,534,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent	$ 1,361,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent	$ 0us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group Including Discontinued Operation Pre Tax Charge	8,600,000med_DisposalGroupIncludingDiscontinuedOperationPreTaxCharge / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Disposal Group Including Discontinued Operation Termination Benefits	600,000med_DisposalGroupIncludingDiscontinuedOperationTerminationBenefits / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Disposal Group Including Discontinued Operation Impaired Assets	3,300,000med_DisposalGroupIncludingDiscontinuedOperationImpairedAssets / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Disposal Group Including Discontinued Operation Other Facility Related Costs	500,000med_DisposalGroupIncludingDiscontinuedOperationOtherFacilityRelatedCosts / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Customer Refunds	900,000med_CustomerRefunds / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Accrued Liabilities	6,500,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Severance Costs	600,000us-gaap_SeveranceCosts1 / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Other Cost of Services	400,000us-gaap_OtherCostOfServices / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	200,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Disposal Group Including Discontinued Operation Closed Clinic Lease Obligations	4,400,000med_DisposalGroupIncludingDiscontinuedOperationClosedClinicLeaseObligations / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Disposal Group Including Discontinued Operation Closed Clinic Closure Cost	7,400,000med_DisposalGroupIncludingDiscontinuedOperationClosedClinicClosureCost / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	2,100,000med_DisposalGroupIncludingDiscontinuedOperationClosedClinicClosureCost / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Disposal Group Including Discontinued Operation Accrual Closed Clinic Lease Obligations	$ 4,600,000med_DisposalGroupIncludingDiscontinuedOperationAccrualClosedClinicLeaseObligations / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember

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Amount of customer refunds during the reporting period.

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Disposal group including discontinued operation accrual closed clinic lease obligations.

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Disposal group including discontinued operation closed clinic closure cost.

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This element represents the amount used for closed clinic lease obligations.

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Disposal group including discontinued operation impaired assets.

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Disposal group including discontinued operation other facility related costs.

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Disposal group including discontinued operation pre tax charge.

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Disposal group including discontinued operation termination benefits.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.

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-Publisher FASB

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-SubTopic 210

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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Other costs incurred and are directly related to services rendered by an entity during the reporting period.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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