Revenue Recognition - Summary of Revenue Disaggregated by Program (Details) - USD ($) $ in Thousands		3 Months Ended										12 Months Ended
		Dec. 31, 2021	[1]	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	[2]	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Revenue		$ 126,808		$ 126,289	$ 120,071	$ 108,085	$ 100,617		$ 95,481	$ 81,923	$ 159,692	$ 481,252	$ 437,714	$ 633,066
Continuing Operations
Disaggregation Of Revenue [Line Items]
Revenue												481,252	437,714	633,066
Continuing Operations | SilverSneakers
Disaggregation Of Revenue [Line Items]
Revenue												362,767	313,575	492,778
Continuing Operations | Prime Fitness
Disaggregation Of Revenue [Line Items]
Revenue												94,254	95,015	120,949
Continuing Operations | WholeHealth Living
Disaggregation Of Revenue [Line Items]
Revenue												23,777	19,776	18,511
Continuing Operations | Other
Disaggregation Of Revenue [Line Items]
Revenue	[3]											$ 454	$ 9,348	$ 828

[1] Loss from continuing operations for the fourth quarter of 2021 includes an unrealized loss of $41.4 million related to the change in fair value of the Sharecare Equity Security and an unrealized gain of $1.9 million related to the de-designated swaps, each of which was recorded to other (income) expense, net. The income tax benefit that would have otherwise resulted from the unrealized loss of $41.4 million was fully offset by income tax expense due to an increase in the valuation allowance on deferred tax assets related to capital loss carryforwards; therefore, there was no net income tax benefit associated with this loss.  In addition, loss from continuing operations for the fourth quarter of 2021 includes a total of $0.5 million related to CEO transition costs, acquisition and integration costs, and project costs, which was primarily recorded to selling, general, and administrative expenses. Finally, the impact of potentially dilutive securities for the three months ended December 31, 2021 was not considered because the impact would be anti-dilutive.

[2] Income from continuing operations for the fourth quarter of 2020 includes strategic project costs, CEO transition costs, and acquisition and integration costs of $2.3 million, $1.0 million, and $0.6 million, respectively, each of which were primarily recorded to selling, general, and administrative expenses.

[3] For the year ended December 31, 2020, other revenue in the table above includes $6.8 million from a well-being program with a large employer (which we do not expect to recur at this level) and $2.2 million of revenue from home-delivered meals.