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Income Taxes - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 17, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Tax Credit Carryforward [Line Items] |  |  |  |
Operating Loss Carryforwards Expiration Year |  | 2031 |  |
Payments To Civil Penalty | $ 3,700,000 med_PaymentsToCivilPenalty |  |  |
Operating Loss Carryforwards |  | 10,600,000 us-gaap_OperatingLossCarryforwards |  |
Income Tax Expense (Benefit), Intraperiod Tax Allocation |  | 4,905,000 us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation | 9,978,000 us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation | 7,400,000 us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation
Maryland State |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax Credit Carryforward, Amount |  | $ 197,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_StatementGeographicalAxis = med_MarylandStateMember |  |
Tax Credit Carryforward Expiration Year |  | 2018 |  |

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- Definition The sum of income tax expense or benefit for the period that has been allocated among continuing operations, discontinued operations, extraordinary items, other comprehensive income, and items charged or credited directly to shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e38679-109324 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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