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Summary of Accrued (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Summary Of Expenses [Line Items]    
Charges incurred during the period $ 0med_ChargesForExpensesIncurred  
Adjustments recorded during the period (549,000)med_AdjustmentsRecordedDuringPeriod [1]  
Payments during the period (2,042,000)med_PaymentsForExpensesIncurred  
Accrued Balance $ 3,943,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent $ 6,534,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
[1] The adjustments to the accrual recorded in the first quarter of 2015 relate primarily to favorable termination agreements reached with landlords of closed Corporate Medifast Weight Control Centers.