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Segment Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 93,571,000 | $ 78,255,000 | $ 182,496,000 | $ 152,550,000 |
Cost of Sales | 23,431,000 | 19,214,000 | 45,600,000 | 36,829,000 |
Selling, General and Administrative Expense | 62,734,000 | 47,969,000 | 120,970,000 | 92,900,000 |
Depreciation and Amortization | 2,808,000 | 2,015,000 | 5,190,000 | 3,662,000 |
Interest(net) and other | (904,000) | (85,000) | (1,100,000) | (264,000) |
Income before income taxes | 5,502,000 | 9,142,000 | 11,836,000 | 19,423,000 |
Segment Assets | 120,958,000 | 101,906,000 | 120,958,000 | 101,906,000 | 105,665,000
Medifast Inc |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 78,220,000 | 68,603,000 | 153,773,000 | 134,700,000 |
Cost of Sales | 19,782,000 | 16,920,000 | 38,709,000 | 32,650,000 |
Selling, General and Administrative Expense | 47,173,000 | 39,735,000 | 92,084,000 | 78,129,000 |
Depreciation and Amortization | 2,030,000 | 1,648,000 | 3,825,000 | 2,965,000 |
Interest(net) and other | 14,000 | 3,000 | 47,000 | 10,000 |
Income before income taxes | 9,221,000 | 10,297,000 | 19,108,000 | 20,946,000 |
Segment Assets | 76,898,000 | 51,687,000 | 76,898,000 | 51,687,000 |
Mwcc And Wholesales |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 15,351,000 | 9,652,000 | 28,723,000 | 17,850,000 |
Cost of Sales | 3,649,000 | 2,294,000 | 6,891,000 | 4,179,000 |
Selling, General and Administrative Expense | 10,279,000 | 6,664,000 | 22,115,000 | 11,820,000 |
Depreciation and Amortization | 720,000 | 283,000 | 1,230,000 | 532,000 |
Interest(net) and other | 4,000 |  | 8,000 |  |
Income before income taxes | 699,000 | 411,000 | (1,521,000) | 1,319,000 |
Segment Assets | 15,853,000 | 10,849,000 | 15,853,000 | 10,849,000 |
Other Entity |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Selling, General and Administrative Expense | 5,282,000 | 1,570,000 | 6,771,000 | 2,951,000 |
Depreciation and Amortization | 58,000 | 84,000 | 135,000 | 165,000 |
Interest(net) and other | (922,000) | (88,000) | (1,155,000) | (274,000) |
Income before income taxes | (4,418,000) | (1,566,000) | (5,751,000) | (2,842,000) |
Segment Assets | $ 28,207,000 | $ 39,370,000 | $ 28,207,000 | $ 39,370,000 |

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