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Segment information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Revenues $ 96,043,000 $ 88,924,000  
Cost of Sales 23,634,000 22,169,000  
Selling, General and Administrative Expense 61,201,000 58,237,000  
Depreciation and Amortization 2,630,000 2,381,000  
Interest(net) and other (132,000) (196,000)  
Income before income taxes 8,710,000 6,333,000  
Segment Assets 135,804,000 117,262,000 130,251,000
Medifast Inc
      
Segment Reporting Information [Line Items]      
Revenues 82,394,000 75,552,000  
Cost of Sales 20,223,000 18,925,000  
Selling, General and Administrative Expense 50,859,000 44,911,000  
Depreciation and Amortization 1,815,000 1,804,000  
Interest(net) and other 29,000 33,000  
Income before income taxes 9,468,000 9,879,000  
Segment Assets 93,088,000 72,802,000  
Mwcc and Wholesales
      
Segment Reporting Information [Line Items]      
Revenues 13,649,000 13,372,000  
Cost of Sales 3,411,000 3,244,000  
Selling, General and Administrative Expense 8,836,000 11,837,000  
Depreciation and Amortization 758,000 500,000  
Interest(net) and other 1,000 4,000  
Income before income taxes 643,000 (2,213,000)  
Segment Assets 13,807,000 14,755,000  
Other
      
Segment Reporting Information [Line Items]      
Revenues 0 0  
Cost of Sales 0 0  
Selling, General and Administrative Expense 1,506,000 1,489,000  
Depreciation and Amortization 57,000 77,000  
Interest(net) and other (162,000) (233,000)  
Income before income taxes (1,401,000) (1,333,000)  
Segment Assets $ 28,909,000 $ 29,705,000