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Fair Value Measurements of Financial Instruments - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Oct. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Marketable securities – certificates of deposit | $ 2,150,000 |  |  |  |
Marketable securities – equity securities | 348,000 | $ 5,567,000 |  |  |
Equity securities, FV-NI, unrealized loss |  | 2,400,000 |  |  |
Investments in other entities – equity method | 25,774,000 | 40,299,000 |  | $ 41,715,000 |
Common stock, par value $0.001; 100,000,000 shares authorized, 46,843,743 and 46,575,699 shares outstanding, excluding 10,584,340 and 10,299,259 treasury shares, at December 31, 2023 and 2022, respectively | $ 47,000 | 47,000 |  |  |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | General and Administrative Expense |  |  |  |
Apollo-Sun Labs Management, LLC |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Remaining equity interest purchase |  | 5,800,000 |  |  |
Business combination, change in fair value of equity interest purchase obligation | $ (2,000,000) | (1,700,000) |  |  |
AAMG |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest acquired (percent) | 100.00% |  | 100.00% |  |
Common stock, par value $0.001; 100,000,000 shares authorized, 46,843,743 and 46,575,699 shares outstanding, excluding 10,584,340 and 10,299,259 treasury shares, at December 31, 2023 and 2022, respectively | $ 157,048 | 184,361 |  |  |
Business combination, contingent consideration, liability | 5,475,000 | 5,849,000 | $ 5,900,000 |  |
Business combination, stock contingent consideration, liability | 5,600,000 | 5,600,000 | $ 5,600,000 |  |
Apollo-Sun Labs Management, LLC |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Remaining equity interest purchase | $ 7,802,000 |  |  |  |
AAMG |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Business combination, contingent consideration, liability |  | 5,851,000 |  |  |
DMG And Sun Labs |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Business combination, equity interest purchase obligation, period to purchase | 3 years |  |  |  |
DMG |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments in other entities – equity method |  | 8,542,000 |  |  |
Other Noncurrent Liabilities | AAMG | 2024 Metric |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Business combination, contingent consideration, liability | $ 2,900,000 |  |  |  |
Other Liabilities | AAMG | 2023 Metric |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Business combination, contingent consideration, liability | 2,600,000 |  |  |  |
Contingent equity securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative asset |  | 1,900,000 |  |  | $ 3,000,000
Interest Rate Swap |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative asset |  | 3,164,000 |  |  |
Interest Rate Swap | Cash Flow Hedging | Not Designated as Hedging Instrument |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unrealized loss | (300,000) |  |  |  |
Interest Rate Swap | Other Noncurrent Assets | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative asset, fair value |  | 3,200,000 |  |  |
Interest Rate Swap | Other Noncurrent Assets | Cash Flow Hedging | Designated as Hedging Instrument | APC |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative asset, fair value | $ 200,000 | 4,200,000 |  |  |
Collar |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative ceiling interest rate | 5.00% |  |  |  |
Derivative, floor interest rate | 2.34% |  |  |  |
Fair value of the collar | $ 300,000 |  |  |  |
Certificates of Deposit |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Marketable securities – certificates of deposit | $ 2,200,000 | $ 0 |  |  |

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