Basis of Presentation (Policies)	9 Months Ended
Sep. 30, 2017
Basis of Presentation [Abstract]
Basis of Presentation	Our financial statements and accompanying notes are prepared in accordance with generally accepted accounting principles in the United States ("U.S. GAAP"). In our opinion, the accompanying consolidated financial statements of Tivity Health, Inc. and its wholly-owned subsidiaries (collectively, "Tivity Health," the "Company," or such terms as "we," "us," or "our") reflect all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement. We have reclassified certain items in prior periods to conform to current classifications. Our results from continuing operations do not include the results of the total population health services ("TPHS") business, which we sold effective July 31, 2016. The TPHS business included our partnerships with Blue Zones, LLC and Dr. Dean Ornish (the Blue Zones Project by Healthways™ and Dr. Dean Ornish's Program for Reversing Heart Disease™, respectively), our joint venture with Gallup, Inc. ("Gallup"), Navvis Healthcare, LLC ("Navvis"), MeYou Health, LLC ("MeYou Health"), and our international operations, including our joint venture with SulAmérica. While Navvis and MeYou Health were part of our TPHS business, they were sold separately to other buyers in November 2015 and June 2016, respectively. Results of operations for the TPHS business have been classified as discontinued operations for all periods presented in the accompanying Consolidated Financial Statements. See Note 3 for further information. On March 11, 2015, we formed a joint venture with SulAmérica, one of the largest independent insurers in Brazil, to sell total population health services to the Brazilian market. With its contribution, SulAmérica acquired a 49% interest in the joint venture, Healthways Brasil Servicos de Consultoria LTDA ("Healthways Brazil"). We determined that our interest in Healthways Brazil represented a controlling financial interest and, therefore, prior to selling the TPHS business, consolidated the financial statements of Healthways Brazil and presented a non-controlling interest for the portion owned by SulAmérica. The net assets and results of operations of Healthways Brazil were part of the sale of the TPHS business and are included within discontinued operations in the accompanying Consolidated Financial Statements. We have omitted certain financial information that is normally included in financial statements prepared in accordance with U.S. GAAP but that is not required for interim reporting purposes. You should read the accompanying consolidated financial statements in conjunction with the financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2016.

Our financial statements and accompanying notes are prepared in accordance with generally accepted accounting principles in the United States ("U.S. GAAP"). In our opinion, the accompanying consolidated financial statements of Tivity Health, Inc. and its wholly-owned subsidiaries (collectively, "Tivity Health," the "Company," or such terms as "we," "us," or "our") reflect all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement. We have reclassified certain items in prior periods to conform to current classifications.

Our results from continuing operations do not include the results of the total population health services ("TPHS") business, which we sold effective July 31, 2016. The TPHS business included our partnerships with Blue Zones, LLC and Dr. Dean Ornish (the Blue Zones Project by Healthways™ and Dr. Dean Ornish's Program for Reversing Heart Disease™, respectively), our joint venture with Gallup, Inc. ("Gallup"), Navvis Healthcare, LLC ("Navvis"), MeYou Health, LLC ("MeYou Health"), and our international operations, including our joint venture with SulAmérica. While Navvis and MeYou Health were part of our TPHS business, they were sold separately to other buyers in November 2015 and June 2016, respectively. Results of operations for the TPHS business have been classified as discontinued operations for all periods presented in the accompanying Consolidated Financial Statements. See Note 3 for further information.

On March 11, 2015, we formed a joint venture with SulAmérica, one of the largest independent insurers in Brazil, to sell total population health services to the Brazilian market. With its contribution, SulAmérica acquired a 49% interest in the joint venture, Healthways Brasil Servicos de Consultoria LTDA ("Healthways Brazil"). We determined that our interest in Healthways Brazil represented a controlling financial interest and, therefore, prior to selling the TPHS business, consolidated the financial statements of Healthways Brazil and presented a non-controlling interest for the portion owned by SulAmérica. The net assets and results of operations of Healthways Brazil were part of the sale of the TPHS business and are included within discontinued operations in the accompanying Consolidated Financial Statements.

We have omitted certain financial information that is normally included in financial statements prepared in accordance with U.S. GAAP but that is not required for interim reporting purposes. You should read the accompanying consolidated financial statements in conjunction with the financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2016.