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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