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Accounts Receivable and Net Revenue - Schedule of Net Patient Service Revenue by Type of Payor (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Health Care Organization, Receivable and Revenue Disclosures [Line Items] |  |  |
Percentage of net patient service revenue | 100.00% | 100.00% | 100.00%
Contracted Managed Care [Member] |  |  |
Health Care Organization, Receivable and Revenue Disclosures [Line Items] |  |  |
Percentage of net patient service revenue | 70.00% | 70.00% | 70.00%
Government [Member] |  |  |
Health Care Organization, Receivable and Revenue Disclosures [Line Items] |  |  |
Percentage of net patient service revenue | 24.00% | 25.00% | 23.00%
Other Third-Parties [Member] |  |  |
Health Care Organization, Receivable and Revenue Disclosures [Line Items] |  |  |
Percentage of net patient service revenue | 4.00% | 4.00% | 6.00%
Private-Pay Patients [Member] |  |  |
Health Care Organization, Receivable and Revenue Disclosures [Line Items] |  |  |
Percentage of net patient service revenue | 2.00% | 1.00% | 1.00%

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- Definition Percentage of net patient service revenue by type payor. + References No definition available. + Details
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Namespace Prefix: | md_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |