Summary of Business and Significant Accounting Policies - Narrative (Details) $ in Thousands	12 Months Ended
Dec. 31, 2024 USD ($) insurance_carrier	Dec. 31, 2023 USD ($)
Defined Contribution Plan Disclosure [Line Items]
Number of health insurance carriers \| insurance_carrier	180
Advertising expense	$ 164,200	$ 148,700
Research and development expense	12,400	13,700
Capitalized internal-use software and website development costs	11,500	9,700
Amortization of internally developed software	14,355	17,376
Capitalized internal-use software and development costs, net	$ 20,700	23,600
Maximum annual contributions per employee, percentage	85.00%
Matching contribution, percent of match	100.00%
Maximum matching contribution percentage	3.00%
Contribution amount	$ 4,200	$ 3,600
Service-Based Awards \| Share-Based Payment Arrangement, Nonemployee
Defined Contribution Plan Disclosure [Line Items]
Vesting term for awards	1 year
Performance And Market-Based Awards
Defined Contribution Plan Disclosure [Line Items]
Vesting term for awards	1 year
Common stock options
Defined Contribution Plan Disclosure [Line Items]
Vesting term for awards	7 years
Market-Based Performance Stock Units
Defined Contribution Plan Disclosure [Line Items]
Vesting term for awards	4 years
Internal-Use Software and Website Development Costs
Defined Contribution Plan Disclosure [Line Items]
Useful life (in years)	3 years
Maximum \| Service-Based Awards \| Share-Based Payment Arrangement, Employee
Defined Contribution Plan Disclosure [Line Items]
Vesting term for awards	4 years
Maximum \| Performance And Market-Based Awards
Defined Contribution Plan Disclosure [Line Items]
Percent of target	200.00%
Maximum \| Non-Market Based Performance Stock Units
Defined Contribution Plan Disclosure [Line Items]
Vesting term for awards	2 years
Minimum \| Service-Based Awards \| Share-Based Payment Arrangement, Employee
Defined Contribution Plan Disclosure [Line Items]
Vesting term for awards	3 years
Minimum \| Performance And Market-Based Awards
Defined Contribution Plan Disclosure [Line Items]
Percent of target	0.00%
Minimum \| Non-Market Based Performance Stock Units
Defined Contribution Plan Disclosure [Line Items]
Vesting term for awards	1 year
Medicare \| Medicare Advantage \| Maximum
Defined Contribution Plan Disclosure [Line Items]
Average plan duration (in years)	15 years
Medicare \| Medicare Advantage \| Minimum
Defined Contribution Plan Disclosure [Line Items]
Average plan duration (in years)	2 years
Medicare \| Medicare Advantage \| Median
Defined Contribution Plan Disclosure [Line Items]
Average plan duration (in years)	3 years
Medicare \| Medicare Supplement
Defined Contribution Plan Disclosure [Line Items]
Average plan duration (in years)	4 years
Medicare \| Medicare Part D
Defined Contribution Plan Disclosure [Line Items]
Average plan duration (in years)	5 years
Individual and Family \| Maximum
Defined Contribution Plan Disclosure [Line Items]
Average plan duration (in years)	2 years
Individual and Family \| Minimum
Defined Contribution Plan Disclosure [Line Items]
Average plan duration (in years)	1 year 6 months
Ancillary \| Maximum \| Short-term
Defined Contribution Plan Disclosure [Line Items]
Average plan duration (in years)	6 months
Ancillary \| Maximum \| Other
Defined Contribution Plan Disclosure [Line Items]
Average plan duration (in years)	6 years
Ancillary \| Minimum \| Other
Defined Contribution Plan Disclosure [Line Items]
Average plan duration (in years)	1 year
Revenue from Contract with Customer \| Product Concentration Risk \| Medicare
Defined Contribution Plan Disclosure [Line Items]
Concentration risk, percentage	93.00%	89.00%

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