Significant Accounting Policies - Percentage of Net Service Revenue Earned by Category of Payor (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
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	62.20%	66.40%	63.10%	67.30%
Medicare | Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	93.80%	92.90%	94.00%	92.40%
Medicare | Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	50.10%	56.60%	51.40%	55.80%
Medicare | HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	17.80%	30.70%	19.50%	27.30%
Managed Care, Commercial, and Other | Home health services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	37.80%	33.60%	36.90%	32.70%
Managed Care, Commercial, and Other | Hospice services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	6.20%	7.10%	6.00%	7.60%
Managed Care, Commercial, and Other | Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	67.90%	79.10%	69.30%	79.30%
Managed Care, Commercial, and Other | Facility-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	49.90%	43.40%	48.60%	44.20%
Managed Care, Commercial, and Other | HCI
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	82.20%	69.30%	80.50%	72.70%
Medicaid | Home and community-based services
Disaggregation of Revenue [Line Items]
Percentage of net service revenue	32.10%	20.90%	30.70%	20.70%