Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Percentage of Net Service Revenue Earned by Category of Payor (Detail)

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Summary of Significant Accounting Policies - Percentage of Net Service Revenue Earned by Category of Payor (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 70.20% 71.80% 72.60%
Home health | Managed Care, Commercial, and Other      
Significant Accounting Policies [Line Items]      
Percentage of net service revenue 29.80% 28.20% 27.40%
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 92.00% 90.70% 92.90%
Hospice | Managed Care, Commercial, and Other      
Significant Accounting Policies [Line Items]      
Percentage of net service revenue 8.00% 9.30% 7.10%
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 23.20% 23.90% 18.90%
Home and Community-Based | Managed Care, Commercial, and Other      
Significant Accounting Policies [Line Items]      
Percentage of net service revenue 76.80% 76.10% 81.10%
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 56.20% 59.70% 63.70%
Facility-Based | Managed Care, Commercial, and Other      
Significant Accounting Policies [Line Items]      
Percentage of net service revenue 43.80% 40.30% 36.30%
Healthcare Innovations      
Significant Accounting Policies [Line Items]      
Percentage of net service revenue 100.00% 100.00% 0.00%
Healthcare Innovations | Medicare      
Significant Accounting Policies [Line Items]      
Percentage of net service revenue 21.60% 22.80% 0.00%
Healthcare Innovations | Managed Care, Commercial, and Other      
Significant Accounting Policies [Line Items]      
Percentage of net service revenue 78.40% 77.20% 0.00%