Redeemable Non-Controlling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Changes in Carrying Amount (Fair Value) of Redeemable Non-Controlling Interests [Roll Forward]
Beginning balance	$ 167,515
Net income allocated to redeemable non-controlling interest	4,426	$ 6,902	$ 11,358
Ending balance	174,828	167,515
Carrying Amount (Fair Value) of Redeemable Non-Controlling Interest [Abstract]
Fair value	174,828	167,515
Redeemable Non-Controlling Interest [Member]
Changes in Carrying Amount (Fair Value) of Redeemable Non-Controlling Interests [Roll Forward]
Beginning balance	167,515	155,262	132,340
Net income allocated to redeemable non-controlling interest	4,426	6,902	11,358
Distributions to redeemable non-controlling interest partners	(11,533)	(10,102)	(11,359)
Changes in the fair value of redeemable non-controlling interest	13,565	3,862	13,011
Purchases of redeemable non-controlling interest	(12,073)	(16,061)	(30,204)
Acquired interest	11,007	26,746	39,862
Contributed capital	0	231	0
Sales of redeemable non-controlling interest	5,012	1,982	982
Changes in notes receivable related to redeemable non-controlling interest	(3,091)	(1,901)	(914)
Adjustments in notes receivables related to the sales of redeemable non-controlling interest	0	594	186
Ending balance	174,828	167,515	155,262
Carrying Amount (Fair Value) of Redeemable Non-Controlling Interest [Abstract]
Contractual time period has lapsed but holder's employment has not been terminated	96,876	75,688	80,781
Contractual time period has not lapsed and holder's employment has not been terminated	77,952	91,827	74,481
Holder's employment has terminated and contractual time period has expired	0	0	0
Holder's employment has terminated and contractual time period has not expired	0	0	0
Fair value	$ 174,828	$ 167,515	$ 155,262
Therapy Practice [Member] | Minimum [Member]
Business Combination, Description [Abstract]
Business acquisition, percentage of limited partnership acquired	50.00%
Therapy Practice [Member] | Maximum [Member]
Business Combination, Description [Abstract]
Business acquisition, percentage of limited partnership acquired	90.00%
Therapy Practice [Member] | NewCo. [Member]
Business Combination, Description [Abstract]
Percentage of equity interest of subsidiary contributed for acquisition	100.00%
Business acquisition, percentage of general partnership interest acquired	100.00%
Business acquisition, consideration payable, term of note	2 years
Employment agreement renewal term	1 year
Non-Compete agreement term under condition of termination of employment of employed selling shareholder	2 years
Therapy Practice [Member] | NewCo. [Member] | Minimum [Member]
Business Combination, Description [Abstract]
Employment agreement term	3 years
Non-Compete agreement term regardless of whether the selling shareholder is employed	5 years
Therapy Practice [Member] | NewCo. [Member] | Maximum [Member]
Business Combination, Description [Abstract]
Employment agreement term	5 years
Non-Compete agreement term regardless of whether the selling shareholder is employed	6 years
ProgressiveHealth [Member] | NewCo. [Member]
Business Combination, Description [Abstract]
Percentage of equity interest of subsidiary contributed for acquisition	100.00%
Non-Compete agreement term under condition of termination of employment of employed selling shareholder	2 years
Non-Compete agreement term regardless of whether the selling shareholder is employed	7 years
Percentage of right to sell equity interest on each of the 4th and 5th anniversaries	30.00%
Percentage of right to sell equity interest on each of the 6th and 7th anniversaries	10.00%