Basis of Presentation and Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended					9 Months Ended					12 Months Ended	21 Months Ended
	Sep. 30, 2023	May 31, 2023 USD ($)	Jan. 31, 2023 USD ($)	Sep. 30, 2024 USD ($) $ / shares shares		Sep. 30, 2023 USD ($) $ / shares		Jun. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment reporting_unit $ / shares shares		Sep. 30, 2023 USD ($) $ / shares		Sep. 20, 2023 USD ($)	Dec. 31, 2023 USD ($) shares	Sep. 30, 2024 USD ($) shares
Description Of Business And Significant Accounting Policies [Line Items]
Recapitalization exchange ratio, units | shares				2,524,000					2,524,000						2,524,000
Net income (loss) attributable to common shareholders				$ 1,100		$ 1,700			$ (5,300)		$ 1,700
Net loss				(888)	[1]	11,924	[1]		(24,463)	[1]	11,924	[2]
Net Income attributable to Legacy AON shareholders				0		15,489			$ 0		27,081		$ 27,000
Number of operating segments | segment									1
Number of reportable segments | segment									1
Revenue, performance obligation, amount				0		0			$ 0		0
Revenue				470,279		$ 336,305			1,268,600		$ 955,003
Offering costs									$ 800
Shares repurchased (in shares) | shares									126,728					14,729	141,457
Cost of shares repurchased (less than)				400					$ 400					$ 100
Number of reporting units | reporting_unit									1
Fair value of warrants				$ 2,023					$ 2,023					$ 0	$ 2,023
Number of securities called by each warrant (in shares) | shares				1					1						1
Reverse recapitalization, equity conversion ratio				1					1						1
Earnings (loss) per unit, basic (in usd per share) | $ / shares				$ (190)		$ (0.61)			$ (900)		$ (0.61)
Earnings (loss) per unit, diluted (in usd per share) | $ / shares				$ (190)		$ (0.61)			$ (940)		$ (0.61)
Accrued dividend rate (in percent)									8.00%
Trade Names
Description Of Business And Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life (in years)				10 years					10 years						10 years
Participating Threshold, 1
Description Of Business And Significant Accounting Policies [Line Items]
Recapitalization exchange ratio, units | shares				2,524,000					2,524,000						2,524,000
Participating Threshold, 2
Description Of Business And Significant Accounting Policies [Line Items]
Recapitalization exchange ratio, units | shares				2,453,000					2,453,000						2,453,000
Participating Threshold, 3
Description Of Business And Significant Accounting Policies [Line Items]
Recapitalization exchange ratio, units | shares				1,976,000					1,976,000						1,976,000
AON LLC
Description Of Business And Significant Accounting Policies [Line Items]
Reverse recapitalization, equity conversion ratio													1
AON LLC | Series A Preferred Stock
Description Of Business And Significant Accounting Policies [Line Items]
Recapitalization exchange ratio, units | shares				2,705,000					2,705,000						2,705,000
Preferred Class A
Description Of Business And Significant Accounting Policies [Line Items]
Accrued dividend rate (in percent)									8.00%
Public Warrant
Description Of Business And Significant Accounting Policies [Line Items]
Fair value of warrants				$ 1,200					$ 1,200						$ 1,200
Private Placement Warrants
Description Of Business And Significant Accounting Policies [Line Items]
Fair value of warrants				$ 900					$ 900						$ 900
Private Placement Warrants | Measurement Input, Expected Dividend Rate
Description Of Business And Significant Accounting Policies [Line Items]
Warrants, measurement input				0.000					0.000						0.000
Private Placement Warrants | Measurement Input, Price Volatility
Description Of Business And Significant Accounting Policies [Line Items]
Warrants, measurement input				0.3350					0.3350						0.3350
Private Placement Warrants | Measurement Input, Risk Free Interest Rate
Description Of Business And Significant Accounting Policies [Line Items]
Warrants, measurement input				0.0355					0.0355						0.0355
Private Placement Warrants | Measurement Input, Expected Term
Description Of Business And Significant Accounting Policies [Line Items]
Warrants, measurement input				5					5						5
Professional Malpractice Liability Insurance
Description Of Business And Significant Accounting Policies [Line Items]
Malpractice insurance, coverage per claim									$ 1,000
Malpractice insurance, limit per policy period									3,000
Directors and Officers Liability Insurance
Description Of Business And Significant Accounting Policies [Line Items]
Malpractice insurance, coverage per claim									2,000
Malpractice insurance, limit per policy period									4,000
OCP Management Arizona, LLP
Description Of Business And Significant Accounting Policies [Line Items]
Noncash consideration of equity method investment			$ 2,300
Equity method investment (in percent)			49.00%
Patient Visits
Description Of Business And Significant Accounting Policies [Line Items]
Revenue				$ 315,300		$ 242,500			860,900		$ 687,400
Clinical Trials
Description Of Business And Significant Accounting Policies [Line Items]
Revenue				$ 0		$ 2,200			$ 500		$ 3,700
AON LLC | AON Inc.
Description Of Business And Significant Accounting Policies [Line Items]
Allocation of income to controlling and noncontrolling interests (in percent)				36.10%		19.00%			29.00%		19.00%
AON LLC | Legacy AON Shareholders
Description Of Business And Significant Accounting Policies [Line Items]
Allocation of income to controlling and noncontrolling interests (in percent)	81.00%			63.90%					71.00%		100.00%		100.00%
MIBA
Description Of Business And Significant Accounting Policies [Line Items]
Allocation of income to controlling and noncontrolling interests (in percent)		56.00%
Payments to acquire interest in subsidiary		$ 200						$ 200

[1] The acronyms in the table above are defined as follows: APIC - Accumulated paid in capital AOCI - Accumulated other comprehensive income NCI - Mezzanine equity classified noncontrolling interest

[2] The acronyms in the table above are defined as follows: APIC - Accumulated paid in capital AOCI - Accumulated other comprehensive income NCI - Mezzanine equity classified noncontrolling interest