Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Increase in valuation allowance on deferred tax assets related to net operating loss carryforwards	$ 4,000,000.0
Increase in income tax expense	2,700,000
Capital loss carryforwards	7,844,000		$ 7,620,000
Valuation allowance	14,435,000		10,457,000
Tax effect related to interest rate swap agreements	4,147,000		0
Tax expense necessary to revalue deferred tax assets and liabilities		$ 5,000,000.0
Federal corporate tax rate		21.00%
Tax expense recorded to adjust deferred tax assets due to mandatory deemed repatriation of undistributed foreign earnings		$ 2,500,000
Undistributed earnings of foreign subsidiaries	0		0
Unrecognized tax benefits	1,061,000	$ 644,000	$ 0
Unrecognized tax benefits that affect our effective tax rate	0
Indefinite Carryforward
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	8,000,000.0
Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 30,700,000
Earliest Tax Year
Operating Loss Carryforwards [Line Items]
Open tax year	2016
Earliest Tax Year | Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, expiration dates	Dec. 31, 2021
Latest Tax Year | Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, expiration dates	Dec. 31, 2023
Nutrisystem, Inc.
Operating Loss Carryforwards [Line Items]
Increase in valuation allowance on deferred tax assets related to net operating loss carryforwards	$ 800,000
International
Operating Loss Carryforwards [Line Items]
Operating loss carry forwards valuation allowance	2,400,000
Operating loss carryforwards	8,100,000
State
Operating Loss Carryforwards [Line Items]
Increase in valuation allowance on deferred tax assets related to net operating loss carryforwards	1,800,000
Reduction in deferred tax asset related to income tax credits	900,000
Operating loss carry forwards valuation allowance	4,200,000
Operating loss carryforwards	$ 119,000,000.0
State | Earliest Tax Year
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration dates	Dec. 31, 2021
State | Latest Tax Year
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration dates	Dec. 31, 2038
State | Income Tax Expenses
Operating Loss Carryforwards [Line Items]
Increase in valuation allowance on deferred tax assets related to net operating loss carryforwards	$ 3,200