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Stock-based Compensation - Narrative (Details) |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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Mar. 31, 2017 $ / shares | Mar. 31, 2016 $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) performancePeriod $ / shares shares | Dec. 31, 2020 shares | Dec. 31, 2019 shares | Nov. 02, 2023 shares | Apr. 20, 2023 shares | Apr. 15, 2021 shares | Jun. 13, 2018 shares | May 01, 2015 shares | Sep. 23, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  |  | 27,400 | 19,400 | 15,400 | 10,500 | 6,000 |
Number of options issued (in shares) |  |  | 658,000 | 1,895,000 |  |  |  |  |  |  |  |  |
Stock-based compensation capitalized | $ |  |  | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |  |  |  |  |  |
1st Tranche |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average fair value per option granted (in dollars per share) | $ / shares |  |  | $ 20.64 |  |  |  |  |  |  |  |  |  |
2nd Tranche |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average fair value per option granted (in dollars per share) | $ / shares |  |  | $ 20.69 |  |  |  |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of awards issued (in shares) |  |  | 2,152,000 | 2,268,000 |  |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Weighted-average fair value per option granted (in dollars per share) | $ / shares |  |  | $ 33.85 | $ 28.23 | $ 21.10 |  |  |  |  |  |  |  |
Aggregate intrinsic value, vested | $ |  |  | $ 20,200,000 | $ 11,600,000 | $ 7,300,000 |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 1,281,000 |  |  |  |  |  |  |  |  |  |
RSUs | New Century Health |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |  |  |  |  |  |  |
RSUs | Non-Employee Directors |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |  |  |  |  |  |  |
RSUs | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requisite service period for vesting |  |  | 3 years |  |  |  |  |  |  |  |  |  |
RSUs | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requisite service period for vesting |  |  | 4 years |  |  |  |  |  |  |  |  |  |
RSUs | 1st Tranche |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  | 33.00% |  |  |  |  |  |  |  |  |  |
Leveraged Stock Units (LSUs) |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of awards issued (in shares) |  |  | 0 | 520,000 |  |  |  |  |  |  |  |  |
Weighted-average fair value per option granted (in dollars per share) | $ / shares |  |  | $ 9.15 |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 520,000 |  |  | 500,000 | 700,000 |  |  |  |  |  |
PSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of awards issued (in shares) |  |  | 1,653,000 | 1,396,000 |  |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Weighted-average fair value per option granted (in dollars per share) | $ / shares |  |  | $ 34.07 |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 542,000 | 500,000 | 300,000 |  |  |  |  |  |  |  |
Performance goal threshold |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Maximum performance achieved, percentage of targeted shares earned |  |  | 250.00% |  | 200.00% |  |  |  |  |  |  |  |
Percentage adjustment of shares earned, total shareholder return in top quartile |  |  |  |  | 10.00% |  |  |  |  |  |  |  |
Number of performance period | performancePeriod |  |  |  |  | 2 |  |  |  |  |  |  |  |
PSUs | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDA, goal period |  |  |  |  | 2 years |  |  |  |  |  |  |  |
PSUs | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDA, goal period |  |  |  |  | 3 years |  |  |  |  |  |  |  |
PSUs | 1st Tranche |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate |  |  | 0.12% |  |  |  |  |  |  |  |  |  |
Expected volatility rate |  |  | 89.50% |  |  |  |  |  |  |  |  |  |
Expected term |  |  | 2 years |  |  |  |  |  |  |  |  |  |
Expected dividend rate |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
PSUs | 2nd Tranche |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Expected volatility rate |  |  | 77.70% |  |  |  |  |  |  |  |  |  |
Expected term |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Expected dividend rate |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Expiration period |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Fair value of options vested | $ |  |  | $ 600,000 | $ 2,600,000 | $ 4,900,000 |  |  |  |  |  |  |  |
Intrinsic value of options exercised | $ |  |  | $ 26,900,000 | $ 16,300,000 | $ 20,800,000 |  |  |  |  |  |  |  |
Performance-based stock options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options issued (in shares) |  |  | 106,000 | 268,000 |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate |  | 1.83% |  |  |  |  |  |  |  |  |  |  |
Expected volatility rate |  | 65.00% |  |  |  |  |  |  |  |  |  |  |
Expected term |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Expected dividend rate |  | 0.00% |  |  |  |  |  |  |  |  |  |  |
Weighted-average fair value per option granted (in dollars per share) | $ / shares |  | $ 6.68 |  |  |  |  |  |  |  |  |  |  |
Performance-based stock options | Vest on March 1, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Performance-based stock options | Vest on March 1, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Common Class A | Performance-based stock options | 1st Tranche |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage | 33.33% |  |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, share price threshold (in dollars per share) | $ / shares | $ 13.35 |  |  |  |  |  |  |  |  |  |  |  |
Consecutive term |  | 90 days |  |  |  |  |  |  |  |  |  |  |
Common Class A | Performance-based stock options | 2nd Tranche |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage | 33.33% |  |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, share price threshold (in dollars per share) | $ / shares | $ 16.43 |  |  |  |  |  |  |  |  |  |  |  |
Consecutive term |  | 90 days |  |  |  |  |  |  |  |  |  |  |
Common Class A | Performance-based stock options | 3rd Tranche |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage | 33.33% |  |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, share price threshold (in dollars per share) | $ / shares | $ 19.51 |  |  |  |  |  |  |  |  |  |  |  |
Consecutive term |  | 90 days |  |  |  |  |  |  |  |  |  |  |
2011 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options issued (in shares) |  |  | 4,800,000 |  |  |  |  |  |  |  |  |  |
2011 Plan | Restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of awards issued (in shares) |  |  |  | 3,800,000 |  |  |  |  |  |  |  |  |
2011 Plan | Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 9,100,000
2015 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options issued (in shares) |  |  | 2,800,000 | 2,800,000 |  |  |  |  |  |  |  |  |
2015 Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of awards issued (in shares) |  |  | 6,300,000 | 5,500,000 |  |  |  |  |  |  |  |  |
2015 Plan | Leveraged Stock Units (LSUs) |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of awards issued (in shares) |  |  | 1,900,000 | 1,400,000 |  |  |  |  |  |  |  |  |
2015 Plan | PSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of awards issued (in shares) |  |  | 1,500,000 | 800,000 |  |  |  |  |  |  |  |  |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Maximum Performance Achieved, Percentage of Targeted Shares Earned + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Share Price Threshold + References No definition available. + Details
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- Definition Amount of cost capitalized for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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