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Property, Plant and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Continuing Operations
Other Depreciation and Amortization	$ 8,052,000us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember	$ 7,810,000us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember	$ 7,683,000us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Discontinued Operations
Gain (Loss) on Sale of Assets and Asset Impairment Charges	3,300,000us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Medifast Corporate Weight Control Centers | Discontinued Operations
Other Depreciation and Amortization	$ 1,699,000us-gaap_OtherDepreciationAndAmortization / dei_LegalEntityAxis = med_MedifastCorporateWeightControlCentersMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	$ 3,144,000us-gaap_OtherDepreciationAndAmortization / dei_LegalEntityAxis = med_MedifastCorporateWeightControlCentersMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	$ 2,433,000us-gaap_OtherDepreciationAndAmortization / dei_LegalEntityAxis = med_MedifastCorporateWeightControlCentersMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember

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- Definition

Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

+ References

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- Definition

The other noncash expense, not otherwise specified in the taxonomy, charged against earnings in the period to allocate the cost of tangible and intangible assets over their remaining economic lives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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