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Business Segments (Sales by Channel) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net Revenue	$ 70,622	$ 72,345
Take Shape For Life [Member]
Segment Reporting Information [Line Items]
Net Revenue	57,955	56,674
Medifast Direct [Member]
Segment Reporting Information [Line Items]
Net Revenue	8,948	10,927
Franchise Weight Control Centers [Member]
Segment Reporting Information [Line Items]
Net Revenue	3,458	4,247
Medifast Wholesale [Member]
Segment Reporting Information [Line Items]
Net Revenue	$ 261	$ 497

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

+ Details

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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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- Details

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X

- Details

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- Details

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