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Sales by Channel (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Net Revenue	$ 65,936,000	$ 69,017,000	$ 211,461,000	$ 222,982,000
Medifast Direct
Segment Reporting Information [Line Items]
Net Revenue	11,271,000	13,412,000	39,388,000	45,756,000
Take Shape For Life
Segment Reporting Information [Line Items]
Net Revenue	49,883,000	49,931,000	154,243,000	160,950,000
Medifast Weight Control Centers- Franchise
Segment Reporting Information [Line Items]
Net Revenue	4,011,000	4,175,000	13,348,000	11,584,000
Medifast Wholesale
Segment Reporting Information [Line Items]
Net Revenue	$ 771,000	$ 1,499,000	$ 4,482,000	$ 4,692,000

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=26872669&loc=d3e20235-122688

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