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Sales by Channel (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Net Revenue	$ 71,144	$ 72,161	$ 143,489	$ 145,525
Take Shape For Life
Segment Reporting Information [Line Items]
Net Revenue	57,411	52,258	114,085	104,360
Medifast Direct
Segment Reporting Information [Line Items]
Net Revenue	9,324	13,675	20,251	28,117
MWCC- Franchise
Segment Reporting Information [Line Items]
Net Revenue	4,109	4,672	8,355	9,337
Medifast Wholesale
Segment Reporting Information [Line Items]
Net Revenue	$ 300	$ 1,556	$ 798	$ 3,711

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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- Definition

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+ References

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