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Sales by Channel (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net Revenue	$ 272,773,000	$ 285,285,000	$ 324,054,000
Take Shape For Life
Segment Reporting Information [Line Items]
Net Revenue	202,218,000	206,657,000	228,729,000
Medifast Direct
Segment Reporting Information [Line Items]
Net Revenue	48,658,000	57,159,000	75,521,000
Medifast Weight Control Centers- Franchise
Segment Reporting Information [Line Items]
Net Revenue	17,072,000	15,424,000	15,336,000
Medifast Wholesale
Segment Reporting Information [Line Items]
Net Revenue	$ 4,825,000	$ 6,045,000	$ 4,468,000

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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+ References

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