| Component: (Network and Table) | |
|---|---|
| Network | 100420 - Disclosure - INTANGIBLE ASSETS (Schedule of Identifiable Intangible Assets) (Details) (http://www.nutrisystem.com/20161231/taxonomy/role/DisclosureINTANGIBLEASSETSScheduleOfIdentifiableIntangibleAssetsDetails) |
| Table | Schedule Of Finite Lived Intangible Assets [Table] |
| Reporting Entity [Axis] | 0001096376 (http://www.sec.gov/CIK) |
| Finite-Lived Intangible Assets by Major Class | Trade Name [Member] |
| Finite Lived Intangible Assets [Line Items] | Period [Axis] | |
|---|---|---|
2016-12-31 | 2015-12-31 | |
Gross Carrying Amount | ||
Accumulated Amortization | ( | |
Net Carrying Amount | ||