Summary of Significant Accounting Policies - Percentage of Net Service Revenue Earned by Category of Payor (Detail)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Home health
Significant Accounting Policies [Line Items]
Percentage of net service revenue	100.00%	100.00%	100.00%
Home health | Medicare
Significant Accounting Policies [Line Items]
Percentage of net service revenue	59.40%	62.10%	66.80%
Home health | Managed Care, Commercial, and Other
Significant Accounting Policies [Line Items]
Percentage of net service revenue	40.60%	37.90%	33.20%
Hospice
Significant Accounting Policies [Line Items]
Percentage of net service revenue	100.00%	100.00%	100.00%
Hospice | Medicare
Significant Accounting Policies [Line Items]
Percentage of net service revenue	93.10%	94.20%	93.10%
Hospice | Managed Care, Commercial, and Other
Significant Accounting Policies [Line Items]
Percentage of net service revenue	6.90%	5.80%	6.90%
Home and Community-Based
Significant Accounting Policies [Line Items]
Percentage of net service revenue	100.00%	100.00%	100.00%
Home and Community-Based | Medicaid
Significant Accounting Policies [Line Items]
Percentage of net service revenue	36.60%	31.50%	21.40%
Home and Community-Based | Managed Care, Commercial, and Other
Significant Accounting Policies [Line Items]
Percentage of net service revenue	63.40%	68.50%	78.60%
Facility-Based
Significant Accounting Policies [Line Items]
Percentage of net service revenue	100.00%	100.00%	100.00%
Facility-Based | Medicare
Significant Accounting Policies [Line Items]
Percentage of net service revenue	54.30%	49.90%	55.00%
Facility-Based | Managed Care, Commercial, and Other
Significant Accounting Policies [Line Items]
Percentage of net service revenue	45.70%	50.10%	45.00%
Healthcare Innovations
Significant Accounting Policies [Line Items]
Percentage of net service revenue	100.00%	100.00%	100.00%
Healthcare Innovations | Medicare
Significant Accounting Policies [Line Items]
Percentage of net service revenue	6.00%	12.40%	19.20%
Healthcare Innovations | Managed Care, Commercial, and Other
Significant Accounting Policies [Line Items]
Percentage of net service revenue	94.00%	87.60%	80.80%