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Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2012 LegalMatter | Sep. 30, 2011 LegalMatter | Jun. 30, 2012 Current Employees LegalMatter | Jun. 30, 2012 Former Employees LegalMatter | Jul. 20, 2012 Subsequent Event
Loss Contingencies [Line Items] |  |  |  |  |
Accrued estimated civil penalty |  |  |  |  | $ 3.7
Notices of Charge of discrimination received | 7 |  | 2 | 3 |
Number of plaintiffs dismissed |  | 2 |  |  |

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- Definition Contingent Civil Penalty + References No definition available. + Details
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Namespace Prefix: | med_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number Of Plaintiffs Dismissed By Court + References No definition available. + Details
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Namespace Prefix: | med_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Period Type: | duration