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