Significant Accounting Policies - Percentage of Net Service Revenue Earned by Category of Payor (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Home health services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	100.00%	100.00%	100.00%	100.00%
Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	100.00%	100.00%	100.00%	100.00%
Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	100.00%	100.00%	100.00%	100.00%
Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	100.00%	100.00%	100.00%	100.00%
HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	100.00%	100.00%	100.00%	100.00%
Medicare | Home health services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	66.40%	70.80%	67.30%	71.10%
Medicare | Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	92.90%	92.90%	92.40%	92.70%
Medicare | Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	56.60%	53.00%	55.80%	55.20%
Medicare | HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	30.70%	23.50%	27.30%	22.80%
Medicaid | Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	20.90%	24.30%	20.70%	24.70%
Managed Care, Commercial, and Other | Home health services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	33.60%	29.20%	32.70%	28.90%
Managed Care, Commercial, and Other | Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	7.10%	7.10%	7.60%	7.30%
Managed Care, Commercial, and Other | Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	79.10%	75.70%	79.30%	75.30%
Managed Care, Commercial, and Other | Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	43.40%	47.00%	44.20%	44.80%
Managed Care, Commercial, and Other | HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	69.30%	76.50%	72.70%	77.20%