Organization and Significant Accounting Policies - Business Description (Details)	12 Months Ended
	Dec. 31, 2023 clinic health_center hospital business_segment state
Segment information
Number of states in which the entity had operations | state	46
Number of business segments | business_segment	4
Critical Illness Recovery Hospital
Segment information
Number of facilities operated by the entity | hospital	107
Rehabilitation Hospital
Segment information
Number of facilities operated by the entity | hospital	33
Outpatient Rehabilitation
Segment information
Number of outpatient rehabilitation clinics operated by entity | clinic	1,933
Concentra
Segment information
Number of occupational health centers operated by entity | health_center	544
Number of onsite clinics | clinic	150