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Business Segments (Sales by Channel) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net Revenue	$ 77,205	$ 68,578	$ 223,556	$ 212,067
Optavia [Member]
Segment Reporting Information [Line Items]
Net Revenue	66,434	56,509	187,935	170,594
Medifast Direct [Member]
Segment Reporting Information [Line Items]
Net Revenue	7,786	8,104	25,309	28,355
Franchise Weight Control Centers [Member]
Segment Reporting Information [Line Items]
Net Revenue	2,763	3,692	9,599	12,047
Medifast Wholesale [Member]
Segment Reporting Information [Line Items]
Net Revenue	$ 222	$ 273	$ 713	$ 1,071

X

- 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=63488584&loc=d3e20235-122688

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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