Recent Relevant Accounting Standards - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 08, 2019	Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right-of-use asset	$ 44,787
Lease liabilities	$ 47,235
ASU 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right-of-use asset			$ 27,000
Lease liabilities			$ 29,700
ASU 2016-02 | Nutrisystem, Inc.
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right-of-use asset		$ 22,100
Lease liabilities		$ 22,100