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Accounts Receivable and Net Revenue - Schedule of Net Revenue (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Receivables [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross revenue |  |  |  |  |  |  |  |  | $ 7,662,556 md_HealthOrganizationRevenueGross | $ 6,702,484 md_HealthOrganizationRevenueGross | $ 5,691,790 md_HealthOrganizationRevenueGross
Contractual adjustments and uncollectibles |  |  |  |  |  |  |  |  | (5,403,437)md_ContractualAdjustmentsAndUncollectibles | (4,695,232)md_ContractualAdjustmentsAndUncollectibles | (3,994,924)md_ContractualAdjustmentsAndUncollectibles
Hospital contract administrative fees |  |  |  |  |  |  |  |  | 179,794 md_HospitalContractAdministrativeFees | 146,760 md_HospitalContractAdministrativeFees | 119,746 md_HospitalContractAdministrativeFees
Net revenue | $ 650,525 us-gaap_HealthCareOrganizationRevenue | $ 626,506 us-gaap_HealthCareOrganizationRevenue | $ 595,544 us-gaap_HealthCareOrganizationRevenue | $ 566,338 us-gaap_HealthCareOrganizationRevenue | $ 567,387 us-gaap_HealthCareOrganizationRevenue | $ 554,730 us-gaap_HealthCareOrganizationRevenue | $ 529,180 us-gaap_HealthCareOrganizationRevenue | $ 502,715 us-gaap_HealthCareOrganizationRevenue | $ 2,438,913 us-gaap_HealthCareOrganizationRevenue | $ 2,154,012 us-gaap_HealthCareOrganizationRevenue | $ 1,816,612 us-gaap_HealthCareOrganizationRevenue

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- Definition Contractual adjustments and uncollectibles. + References No definition available. + Details
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Namespace Prefix: | md_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Health organization revenue gross. + References No definition available. + Details
Name: | md_HealthOrganizationRevenueGross
Namespace Prefix: | md_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Hospital contract administrative fees. + References No definition available. + Details
Name: | md_HospitalContractAdministrativeFees
Namespace Prefix: | md_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of revenues recognized by the entity from providing services to in-patients, outpatients, residents in facilities owned or operated by the entity, from insurance premiums, or from goods provided or services performed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_HealthCareOrganizationRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration