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Business Segments (Sales by Channel) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Net Revenue | $ 274,534 | $ 272,773 | $ 285,285
Take Shape For Life [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Revenue | 222,402 | 202,218 | 206,657
Medifast Direct [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Revenue | 35,144 | 48,658 | 57,159
Franchise Weight Control Centers [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Revenue | 15,669 | 17,072 | 15,424
Medifast Wholesale [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Revenue | $ 1,319 | $ 4,825 | $ 6,045

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- 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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- 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. + Details
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