Significant Accounting Policies - Percentage of Net Service Revenue Earned by Category of Payor (Details)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Home health services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	100.00%	100.00%
Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	100.00%	100.00%
Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	100.00%	100.00%
Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	100.00%	100.00%
HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	100.00%	0.00%
Medicare | Home health services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	71.30%	71.20%
Medicare | Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	92.40%	92.30%
Medicare | Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	57.40%	64.00%
Medicare | HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	22.20%	0.00%
Medicaid | Home health services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	1.00%	0.90%
Medicaid | Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	0.30%	0.60%
Medicaid | Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	25.10%	17.30%
Medicaid | HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	0.50%	0.00%
Managed Care, Commercial, and Other | Home health services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	27.70%	27.90%
Managed Care, Commercial, and Other | Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	7.30%	7.10%
Managed Care, Commercial, and Other | Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	74.90%	82.70%
Managed Care, Commercial, and Other | Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	42.60%	36.00%
Managed Care, Commercial, and Other | HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	77.30%	0.00%