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Business Acquisitions - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Company
Mar. 31, 2014
Dec. 31, 2014
Business Acquisition [Line Items]      
Number of physician group practices acquired 3md_NumberOfPhysicianGroupPractices    
Business acquisition, total consideration $ 37,100,000us-gaap_BusinessCombinationConsiderationTransferred1    
Goodwill 2,813,673,000us-gaap_Goodwill   2,776,188,000us-gaap_Goodwill
Other intangible assets 4,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles    
Other liabilities 1,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther    
Contingent consideration payments related to prior-period acquisitions 400,000us-gaap_PaymentsForPreviousAcquisition 3,400,000us-gaap_PaymentsForPreviousAcquisition  
Goodwill deductible for tax purposes 10,800,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount    
Three Physician Group Practices Acquisition [Member]      
Business Acquisition [Line Items]      
Goodwill 33,600,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= md_ThreePhysicianGroupMember		    
Prior-Period Acquisitions [Member]      
Business Acquisition [Line Items]      
Goodwill 3,900,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= md_PriorPeriodAcquisitionsMember		    
Other intangible assets 5,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= md_PriorPeriodAcquisitionsMember		    
Other liabilities 2,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= md_PriorPeriodAcquisitionsMember		    
Additional cash consideration related to a working capital $ 600,000md_BusinessAcquisitionContingentConsiderationPotentialCashPayment1
/ us-gaap_BusinessAcquisitionAxis
= md_PriorPeriodAcquisitionsMember