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

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- Definition Assumed discount rates used to record accrued contingent consideration using the income approach. + References No definition available. + Details
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- Definition Assumed payment probability of contingent consideration payment. + References No definition available. + Details
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- Definition Business acquisition contingent consideration at fair value decrease. + References No definition available. + Details
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- Definition Business combination, contingent consideration arrangements, time period. + References No definition available. + Details
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- Definition Contingent consideration payments related to prior period acquisitions. + References No definition available. + Details
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- Definition Number Acquisitions Completed + References No definition available. + Details
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- Definition Number Of Joint Ventures + References No definition available. + Details
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- Definition Number of physician group practices. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition For contingent consideration arrangements and indemnification assets recognized in connection with a business combination, this element represents an estimate of the low-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The net gains or losses recognized for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date. + References No definition available. + Details
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- Definition Fair value of contingent consideration in a business combination that is classified in shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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