Basis of Presentation - Table 1 (Details) - state	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Concentration Risk [Line Items]
Number of states in which entity operates	36		36
Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Number of states in which entity operates	31		31
Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Number of states in which entity operates	28		28
Net operating revenues [Member] | Payor Source [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	100.00%	100.00%	100.00%	100.00%
Net operating revenues [Member] | Payor Source [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	100.00%	100.00%	100.00%	100.00%
Net operating revenues [Member] | Payor Source [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	100.00%	100.00%	100.00%	100.00%
Net operating revenues [Member] | Payor Source [Member] | Other Income Source [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.10%	1.10%	1.10%	1.20%
Net operating revenues [Member] | Payor Source [Member] | Other Income Source [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.40%	1.30%	1.30%	1.40%
Net operating revenues [Member] | Payor Source [Member] | Other Income Source [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.10%	0.10%	0.10%	0.10%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Medicare [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	75.70%	74.80%	75.30%	75.00%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Medicare [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	73.30%	73.30%	73.10%	73.30%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Medicare [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	85.20%	81.80%	84.70%	82.40%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Medicare Advantage [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	8.40%	7.90%	8.70%	7.90%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Medicare Advantage [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	8.10%	7.60%	8.40%	7.70%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Medicare Advantage [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	9.60%	8.80%	10.00%	8.90%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Managed Care [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	9.40%	10.10%	9.60%	9.90%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Managed Care [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	10.70%	11.40%	11.00%	11.30%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Managed Care [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	3.90%	4.50%	3.80%	3.70%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Medicaid [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	2.90%	3.30%	2.80%	3.30%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Medicaid [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	3.40%	3.00%	3.10%	3.00%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Medicaid [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.10%	4.70%	1.30%	4.80%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Other Third-party Payors [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.30%	1.50%	1.30%	1.40%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Other Third-party Payors [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.60%	1.80%	1.60%	1.70%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Workers' Compensation [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.70%	0.80%	0.70%	0.80%
Net operating revenues [Member] | Payor Source [Member] | Third-Party Payor [Member] | Workers' Compensation [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.90%	1.00%	0.90%	1.00%
Net operating revenues [Member] | Payor Source [Member] | Self-Pay [Member] | Patients [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.50%	0.50%	0.50%	0.50%
Net operating revenues [Member] | Payor Source [Member] | Self-Pay [Member] | Patients [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.60%	0.60%	0.60%	0.60%
Net operating revenues [Member] | Payor Source [Member] | Self-Pay [Member] | Patients [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.10%	0.10%	0.10%	0.10%