Significant Accounting Policies - Percentage of Net Service Revenue Earned by Category of Payor (Details)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
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%	100.00%
Medicare | Home health services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	68.20%	71.30%
Medicare | Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	92.00%	92.40%
Medicare | Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	54.80%	57.40%
Medicare | HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	24.60%	22.20%
Medicaid | Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	20.60%	25.10%
Managed Care, Commercial, and Other | Home health services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	31.80%	28.70%
Managed Care, Commercial, and Other | Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	8.00%	7.60%
Managed Care, Commercial, and Other | Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	79.40%	74.90%
Managed Care, Commercial, and Other | Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	45.20%	42.60%
Managed Care, Commercial, and Other | HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	75.40%	77.80%