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Leases - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating and Capital Leases [Line Items] |  |  |
Rent expense | $ 5,371,000 | $ 3,753,000 | $ 1,700,000
Equipment lease expense | 1,926,000 | 1,929,000 | 1,813,000
Minimum [Member] |  |  |
Operating and Capital Leases [Line Items] |  |  |
Control Centers leases term | 5 years |  |
Control Centers leases range price | 1,500 |  |
Maximum [Member] |  |  |
Operating and Capital Leases [Line Items] |  |  |
Control Centers leases term | 10 years |  |
Control Centers leases range price | $ 5,000 |  |

X
- Definition the price of the lease + References No definition available. + Details
Name: | med_ControlCentersLeasesRangePrice
Namespace Prefix: | med_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition period of lease + References No definition available. + Details
Name: | med_ControlCentersLeasesTerm
Namespace Prefix: | med_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses. + References No definition available. + Details
Name: | us-gaap_EquipmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration