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Segment Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Revenues $ 356,886,000 $ 356,706,000 $ 298,189,000
Cost of Sales 89,040,000 88,671,000 73,693,000
Selling, General and Administrative Expense 222,874,000 233,568,000 188,770,000
Depreciation and Amortization 11,382,000 11,205,000 8,344,000
Interest(net) and other (597,000) (1,196,000) (298,000)
Income before income taxes 34,187,000 24,458,000 27,680,000
Segment Assets 132,650,000 130,251,000 105,665,000
Medifast Inc
      
Segment Reporting Information [Line Items]      
Revenues 304,249,000 300,511,000 259,191,000
Cost of Sales 75,200,000 74,984,000 63,888,000
Selling, General and Administrative Expense 182,098,000 184,615,000 152,647,000
Depreciation and Amortization 7,600,000 8,081,000 6,416,000
Interest(net) and other 82,000 141,000 30,000
Income before income taxes 39,269,000 32,690,000 36,210,000
Segment Assets 76,182,000 86,944,000 64,388,000
MWCC and Wholesale
      
Segment Reporting Information [Line Items]      
Revenues 52,637,000 56,195,000 38,998,000
Cost of Sales 13,840,000 13,687,000 9,805,000
Selling, General and Administrative Expense 34,899,000 40,194,000 30,335,000
Depreciation and Amortization 3,520,000 2,864,000 1,596,000
Interest(net) and other 36,000 26,000 0
Income before income taxes 342,000 (576,000) (2,738,000)
Segment Assets 10,950,000 14,610,000 12,658,000
Other
      
Segment Reporting Information [Line Items]      
Revenues 0 0 0
Cost of Sales 0 0 0
Selling, General and Administrative Expense 5,877,000 8,759,000 5,788,000
Depreciation and Amortization 262,000 260,000 332,000
Interest(net) and other (715,000) (1,363,000) (328,000)
Income before income taxes (5,424,000) (7,656,000) (5,792,000)
Segment Assets $ 45,518,000 $ 28,697,000 $ 28,619,000