Revenue Recognition - Additional Information (Details)		3 Months Ended										10 Months Ended	12 Months Ended
	Mar. 07, 2019 Segment	Dec. 31, 2019 USD ($)		Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)		Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2019 USD ($) Segment Program Obligation Source		Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Disaggregation Of Revenue [Line Items]
Number of reportable segments | Segment	1											2	2
Revenue, Practical Expedient, Initial Application and Transition, Qualitative Assessment													true
Revenue		$ 272,789,000	[1]	$ 303,897,000	$ 340,377,000	$ 214,094,000	$ 153,037,000	[2]	$ 151,467,000	$ 151,865,000	$ 149,930,000		$ 1,131,157,000	[3]	$ 606,299,000	$ 556,942,000
Healthcare
Disaggregation Of Revenue [Line Items]
Number of programs | Program													3
Number of performance obligations | Obligation													1
Number of performance obligation unsatisfied | Obligation													0
Revenue recognized from performance obligations satisfied in prior period													$ 0
Period of billing in arrears once timing of services to customers is known													1 month
Number of days for customer to make payment after being invoiced													30 days
Capitalized costs		500,000					$ 0					$ 500,000	$ 500,000		0
Capitalized costs, amortized															0	$ 0
Number of reportable segments | Segment													2
Revenue													$ 633,066,000		$ 606,299,000
Nutrition
Disaggregation Of Revenue [Line Items]
Number of sources for revenue recognition | Source													4
Description of return of obligation													Direct to consumer customers may return unopened ready-to-go Nutrisystem products within 30 days after purchase in order to receive a refund or credit.
Return of purchase order to refund or credit, period													30 days
Purchase order canceled of delivery, period													14 days
Revenue													$ 498,091,000
Provision for estimated returns													13,500,000
Nutrition | Accrued Liabilities
Disaggregation Of Revenue [Line Items]
Reserve for estimated returns		$ 800,000										$ 800,000	800,000
Nutrition | Shipping and Handling Charges
Disaggregation Of Revenue [Line Items]
Revenue													$ 17,500,000

[1] During the fourth quarter of 2019, we recorded an impairment loss of $377.1 million related to the Nutrisystem tradename and the goodwill allocated to the Nutrition segment.  In addition, we incurred acquisition, integration, and project costs totaling $5.8 million, which were primarily recorded to selling, general, and administrative expenses (see Note 18 for full year amounts).  Also in the fourth quarter of 2019, we recorded a purchase accounting measurement period adjustment to finalize estimates related to the customer list intangible asset recorded in connection with the acquisition of Nutrisystem.  The finalization of the estimate resulted in incremental amortization expense during the fourth quarter of 2019 of $17.4 million. Our effective tax rate for the fourth quarter of 2019 was a benefit of 15.2%, which was less than our statutory tax benefit rate and represents a decrease compared to the first three quarters of 2019.  This decrease is primarily due to the nondeductible goodwill impairment loss of $137.1 million recorded in the fourth quarter. Finally, the impact of potentially dilutive securities for the three months ended December 31, 2019 was not considered because the impact would be anti-dilutive.

[2] During the fourth quarter of 2018, we incurred $3.3 million of project costs in connection with potential and pending acquisitions, which were recorded to selling, general, and administrative expenses.  In addition, our effective tax rate for the fourth quarter of 2018 of 10.1% was lower than our statutory rate primarily due to positive tax benefits of $4.6 million related to the vesting of stock-based compensation awards during the quarter.

[3] The figure for total segments equals the consolidated figure for each such item.