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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

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