Debt - Credit Facility - Additional Information (Details)		1 Months Ended		3 Months Ended	10 Months Ended	12 Months Ended		22 Months Ended
	Mar. 08, 2019 USD ($)	Dec. 31, 2020 USD ($)	May 31, 2019 Agreement	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)
Line Of Credit Facility [Line Items]
Outstanding debt		$ 466,706,000		$ 466,706,000	$ 1,048,127,000	$ 466,706,000	$ 1,048,127,000	$ 466,706,000
Interest Rate Swap Agreements
Line Of Credit Facility [Line Items]
Number of agreements held for maturity | Agreement			8
Derivative maturity month and year			2024-05
Interest Rate Swap Agreements | LIBOR
Line Of Credit Facility [Line Items]
Derivative, fixed interest rate			2.20%
Eight Interest Rate Swaps
Line Of Credit Facility [Line Items]
Derivative, notional amount		700,000,000.0		700,000,000.0		700,000,000.0		700,000,000.0
Eight Interest Rate Swaps | Hedges
Line Of Credit Facility [Line Items]
Derivative, notional amount		388,900,000		$ 388,900,000		388,900,000		388,900,000
Description of interest rate swaps on derivatives				we concluded that five of the eight interest rate swaps no longer qualified for hedge accounting treatment, and we de-designated these derivatives.
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Available borrowing capacity		124,500,000		$ 124,500,000		$ 124,500,000		124,500,000
Credit Agreement
Line Of Credit Facility [Line Items]
Initiation date						Mar. 08, 2019
Outstanding debt		466,700,000		$ 466,700,000		$ 466,700,000		$ 466,700,000
Net leverage ratio for next twelve month						5.75
Net leverage ratio in year two						5.25
Net leverage ratio thereafter						4.75
Net leverage ratio one						2.36
Debt instrument, prepayments description						We are required to make prepayments on the Term Loans equal to our excess cash flow for a given fiscal year multiplied by the following excess cash flow percentages based on our Net Leverage Ratio (as defined in the Credit Agreement) on the last day of such fiscal year: (a) 75% if the Net Leverage Ratio is greater than 3.75:1, (b) 50% if the Net Leverage Ratio is equal to or less than 3.75:1 but greater than 3.25:1 (c) 25% if the Net Leverage Ratio is equal to or less than 3.25:1 but greater than 2.75:1, and (d) 0% if the Net Leverage Ratio is equal to or less than 2.75:1.
Term loan paydown amount						$ 519,000,000
Commitment fees						$ 500,000	$ 500,000
Credit Agreement | Federal Funds Rate
Line Of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Credit Agreement | One-Month LIBOR
Line Of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Credit Agreement | Net Leverage Ratio Greater Than 3.75:1
Line Of Credit Facility [Line Items]
Excess cash flow percentage						75.00%
Net leverage ratio						375.00%
Credit Agreement | Net Leverage Ratio Equal To or Less Than 3.75:1 but Greater Than 3.25:1
Line Of Credit Facility [Line Items]
Excess cash flow percentage						50.00%
Net leverage ratio						325.00%
Credit Agreement | Net Leverage Ratio Equal To or Less Than 3.25:1 but Greater Than 2.75:1
Line Of Credit Facility [Line Items]
Excess cash flow percentage						25.00%
Net leverage ratio						275.00%
Credit Agreement | Net Leverage Ratio Equal To or Less Than 2.75:1
Line Of Credit Facility [Line Items]
Excess cash flow percentage						0.00%
Credit Agreement | Nutrisystem, Inc.
Line Of Credit Facility [Line Items]
Payments on term loans		$ 519,000,000.0
Credit Agreement | Minimum
Line Of Credit Facility [Line Items]
Unused commitment fee percentage	0.25%
Credit Agreement | Minimum | LIBOR
Line Of Credit Facility [Line Items]
Variable rate basis	0.00%
Credit Agreement | Maximum
Line Of Credit Facility [Line Items]
Unused commitment fee percentage	0.50%
Credit Agreement | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 125,000,000.0
Maturity date						Mar. 08, 2024
Credit Agreement | Revolving Credit Facility | Minimum | LIBOR
Line Of Credit Facility [Line Items]
Margin rate	3.75%
Credit Agreement | Revolving Credit Facility | Minimum | Base Rate
Line Of Credit Facility [Line Items]
Margin rate	2.75%
Credit Agreement | Revolving Credit Facility | Maximum | LIBOR
Line Of Credit Facility [Line Items]
Margin rate	4.25%
Credit Agreement | Revolving Credit Facility | Maximum | Base Rate
Line Of Credit Facility [Line Items]
Margin rate	3.25%
Credit Agreement | Swingline Sub Facility
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 35,000,000.0
Maturity date						Mar. 08, 2024
Credit Agreement | Letters of Credit Sub Facility
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	50,000,000.0
Credit Agreement | Term Loan Facility A
Line Of Credit Facility [Line Items]
Debt instrument, face amount	$ 350,000,000.0
Periodic principal payment as percentage of aggregate principal amount	2.50%
Maturity date						Mar. 08, 2024
Effective interest rates		6.64%		6.64%	5.47%	6.64%	5.47%	6.64%
Credit Agreement | Term Loan Facility A | LIBOR
Line Of Credit Facility [Line Items]
Margin rate	4.25%
Credit Agreement | Term Loan Facility A | Base Rate
Line Of Credit Facility [Line Items]
Margin rate	3.25%
Credit Agreement | Term Loan Facility B
Line Of Credit Facility [Line Items]
Debt instrument, face amount	$ 830,000,000.0
Periodic principal payment as percentage of aggregate principal amount	0.75%
Maturity date						Mar. 08, 2026
Effective interest rates		7.08%		7.08%	6.27%	7.08%	6.27%	7.08%
Credit Agreement | Term Loan Facility B | LIBOR
Line Of Credit Facility [Line Items]
Margin rate	5.25%
Credit Agreement | Term Loan Facility B | Base Rate
Line Of Credit Facility [Line Items]
Margin rate	4.25%
Credit Agreement | Uncommitted Incremental Accordion Facility | Minimum
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 125,000,000.0
Percentage of consolidated EBITDA requirement	50.00%
Credit Agreement | Term Loans
Line Of Credit Facility [Line Items]
Payments on term loans								$ 164,700,000
Maturity date					Dec. 31, 2021