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Amortization expense (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Expected Amortization Expense [Line Items] |  |  |
Amortization expense | $ 572,000 | $ 456,000 | $ 291,000
Customer lists |  |  |
Expected Amortization Expense [Line Items] |  |  |
Amortization expense | 78,000 | 78,000 | 50,000
Trademarks, patents and copyrights |  |  |
Expected Amortization Expense [Line Items] |  |  |
Amortization expense | $ 494,000 | $ 378,000 | $ 241,000

X
- Details
Name: | med_ExpectedAmortizationExpenseLineItems
Namespace Prefix: | med_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The aggregate expense charged against earnings to allocate the cost of acquired intangible assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. + References No definition available. + Details
Name: | us-gaap_AmortizationOfAcquiredIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration