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Summary of Accrued (Detail) - USD ($)
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Summary Of Expenses [Line Items]    
Adjustments recorded during the period [1] $ (1,418,000)  
Payments during the period (3,542,000)  
Accrued Balance $ 1,574,000 $ 6,534,000
[1] The adjustments to the accrual recorded in the first nine months of 2015 relate primarily to favorable termination agreements reached with landlords of closed Corporate Medifast Weight Control Centers.