Significant Accounting Policies - Percentage of Net Service Revenue Earned by Category of Payor (Details)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
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	64.10%	68.20%
Medicare | Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	94.10%	92.00%
Medicare | Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	52.70%	54.80%
Medicare | HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	21.30%	24.60%
Managed Care, Commercial, and Other | Home health services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	35.90%	31.80%
Managed Care, Commercial, and Other | Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	5.90%	8.00%
Managed Care, Commercial, and Other | Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	70.80%	79.40%
Managed Care, Commercial, and Other | Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	47.30%	45.20%
Managed Care, Commercial, and Other | HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	78.70%	75.40%
Medicaid | Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	29.20%	20.60%