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