Redeemable Non-Controlling Interests - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) subsidiary	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Noncontrolling Interest [Line Items]
Purchase of membership interests of Concentra Group Holdings Parent	$ 6,268	$ 5,876	$ 660,658
Concentra Group Holdings Parent LLC
Noncontrolling Interest [Line Items]
Purchase of membership interests of Concentra Group Holdings Parent	$ 6,300	$ 5,900	$ 660,700
Concentra Group Holdings Parent | Voting Units
Noncontrolling Interest [Line Items]
Outstanding membership interest owned by Select			100.00%
Outside Members Of Other Less Than Wholly Owned Subsidiaries
Noncontrolling Interest [Line Items]
Less than wholly owned subsidiaries | subsidiary	8