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Sales by Channel (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Net Revenue | $ 285,285,000 us-gaap_SalesRevenueNet | $ 324,054,000 us-gaap_SalesRevenueNet | $ 318,571,000 us-gaap_SalesRevenueNet
Medifast Direct |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Revenue | 57,159,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_MedifastDirectMember | 75,521,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_MedifastDirectMember | 84,417,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_MedifastDirectMember
Take Shape For Life |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Revenue | 206,657,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_TakeShapeForLifeMember | 228,729,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_TakeShapeForLifeMember | 216,094,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_TakeShapeForLifeMember
Medifast Weight Control Centers- Franchise |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Revenue | 15,424,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_FranchiseWeightControlCentersMember | 15,336,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_FranchiseWeightControlCentersMember | 14,309,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_FranchiseWeightControlCentersMember
Medifast Wholesale |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Revenue | $ 6,045,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_MedifastWholesalePhysicansMember | $ 4,468,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_MedifastWholesalePhysicansMember | $ 3,751,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = med_MedifastWholesalePhysicansMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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