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Business Acquisitions - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Company
Acquisition
Dec. 31, 2013
Company
Jun. 01, 2014
JointVenture
Business Acquisition [Line Items]      
Number of physician group practices acquired 11md_NumberOfPhysicianGroupPractices 11md_NumberOfPhysicianGroupPractices  
Business acquisition, total consideration $ 488,600,000us-gaap_BusinessCombinationConsiderationTransferred1 $ 250,100,000us-gaap_BusinessCombinationConsiderationTransferred1  
Cash consideration 479,400,000us-gaap_PaymentsToAcquireBusinessesGross 236,700,000us-gaap_PaymentsToAcquireBusinessesGross  
Contingent consideration 9,200,000us-gaap_BusinessCombinationContingentConsiderationLiability 13,400,000us-gaap_BusinessCombinationContingentConsiderationLiability  
Number of acquisitions completed 13md_NumberAcquisitionsCompleted    
Time period for achievement of certain performance measures for payment of contingent consideration, years 5 years    
Business acquisition contingent consideration recorded as liability 8,500,000us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent    
Business acquisition contingent consideration recorded as equity 700,000us-gaap_ContingentConsiderationClassifiedAsEquityFairValueDisclosure    
Assumed payment probability of contingent consideration payment 100.00%md_AssumedPaymentProbabilityOfContingentConsiderationPayment    
Range of the undiscounted amount under contingent consideration agreement, low 0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow    
Range of the undiscounted amount under contingent consideration agreement, high 10,300,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh    
Contingent consideration decrease in fair value 1,600,000md_BusinessAcquisitionContingentConsiderationAtFairValueDecrease    
Contingent consideration payments related to prior-period acquisitions 15,800,000us-gaap_PaymentsForPreviousAcquisition    
Contingent consideration payments related to prior-period acquisitions 37,500,000md_ContingentConsiderationPaymentsRelatedToPriorPeriodAcquisitions    
Number of joint ventures     2md_NumberOfJointVentures
Fair value, contribution credit 7,700,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1    
Carrying value of goodwill transferred 7,200,000us-gaap_GoodwillTransfers    
Fixed assets transferred 500,000us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1    
Gain or loss from the joint venture transaction 0us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses    
Consolidation method ownership interest in joint method 75.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage    
Equity method ownership percentage in joint venture 37.50%us-gaap_EquityMethodInvestmentOwnershipPercentage   37.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
Goodwill 2,776,188,000us-gaap_Goodwill 2,393,731,000us-gaap_Goodwill  
Other intangible assets   29,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles  
Other liabilities   8,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther  
Prior-Period Acquisitions [Member]      
Business Acquisition [Line Items]      
Contingent consideration 35,300,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= md_PriorPeriodAcquisitionsMember		    
11 Physician Group Practices Acquisition [Member]      
Business Acquisition [Line Items]      
Goodwill   $ 228,600,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= md_ElevenPhysicianGroupMember		  
Minimum [Member]      
Business Acquisition [Line Items]      
Assumed discount rates for acquisition-date fair value 2.50%md_AssumedDiscountRatesUsedToRecordAccruedContingentConsiderationUsingIncomeApproach
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum [Member]      
Business Acquisition [Line Items]      
Assumed discount rates for acquisition-date fair value 5.30%md_AssumedDiscountRatesUsedToRecordAccruedContingentConsiderationUsingIncomeApproach
/ us-gaap_RangeAxis
= us-gaap_MaximumMember