| Document and Entity Information - USD ($) $ in Billions | 12 Months Ended | ||
| Dec. 31, 2021 | Feb. 17, 2022 | Jun. 30, 2021 | |
| Cover [Abstract] | |||
| Entity Registrant Name | TIVITY HEALTH, INC. | ||
| Entity Central Index Key | 0000704415 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Trading Symbol | TVTY | ||
| Title of 12(b) Security | Common Stock - $.001 par value | ||
| Security Exchange Name | NASDAQ | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Public Float | $ 1.2 | ||
| Entity Common Stock, Shares Outstanding | 49,823,312 | ||
| Document Fiscal Year Focus | 2021 | ||
| Document Fiscal Period Focus | FY | ||
| Document Type | 10-K/A | ||
| Amendment Flag | true | ||
| Amendment Description | Tivity Health, Inc. (also referred to herein as the “Company”, “we”, “us” or “our”) filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2021 (the “Original Form 10-K”) with the United States Securities and Exchange Commission (the “Commission”) on February 25, 2022. The Company is filing this Amendment No. 1 to the Original Form 10-K (this “Form 10-K/A”) solely for the purpose of including in Part III the information that was to be incorporated by reference from the Company’s definitive proxy statement for its 2022 Annual Meeting of Shareholders, because the Company’s definitive proxy statement will not be filed with the Commission within 120 days after the end of the Company’s fiscal year ended December 31, 2021. This Form 10-K/A hereby amends and restates in their entirety Items 10 through 14 of Part III of the Original Form 10-K. Additionally, this Form 10-K/A hereby amends and restates the cover page of the Original Form 10-K to remove the statement that information is being incorporated by reference from the Company’s definitive proxy statement. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), this Form 10-K/A also contains new certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. Accordingly, Item 15 of Part IV has also been amended and restated in its entirety to include the currently dated certifications as exhibits, and to reference the consolidated financial statements previously filed with the Original Form 10-K. Because no consolidated financial statements have been included in this Form 10-K/A and this Form 10-K/A does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S‑K, paragraphs 3, 4 and 5 of the certifications have been omitted. No attempt has been made in this Form 10-K/A to modify or update the other disclosures presented in the Original Form 10‑K, including, without limitation, the consolidated financial statements. This Form 10-K/A does not reflect events occurring after the filing of the Original Form 10-K or modify or update the disclosures in the Original Form 10-K, except as set forth in this Form 10-K/A, and should be read in conjunction with the Original Form 10-K and the Company’s other filings with the Commission. Terms used but not defined herein are as defined in our Original Form 10-K. As used throughout this Annual Report on Form 10-K (this “Report”), unless the context otherwise indicates, the terms “we,” “us,” “our,” “Tivity Health,” or the “Company” refer collectively to Tivity Health, Inc. and its wholly owned subsidiaries. | ||
| Document Period End Date | Dec. 31, 2021 | ||
| Entity Shell Company | false | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Entity File Number | 000-19364 | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Tax Identification Number | 62-1117144 | ||
| Entity Address, Address Line One | 701 Cool Springs Boulevard | ||
| Entity Address, City or Town | Franklin | ||
| Entity Address, State or Province | TN | ||
| Entity Address, Postal Zip Code | 37067 | ||
| City Area Code | 800 | ||
| Local Phone Number | 869-5311 | ||
| ICFR Auditor Attestation Flag | true | ||
| Auditor Name | PricewaterhouseCoopers LLP | ||
| Auditor Location | Nashville, TN | ||
| Auditor Firm ID | 238 |
