Goodwill and Intangibles - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items]
Document Period End Date	Jun. 30, 2018
Intangible assets, net carrying amount	$ 325,137	$ 134,610
Document Fiscal Year Focus	2018
Home health services
Indefinite-lived Intangible Assets [Line Items]
Intangible assets, net carrying amount	$ 249,100
Hospice Services
Indefinite-lived Intangible Assets [Line Items]
Intangible assets, net carrying amount	35,400
Community-based services
Indefinite-lived Intangible Assets [Line Items]
Intangible assets, net carrying amount	20,700
Facility-based services
Indefinite-lived Intangible Assets [Line Items]
Intangible assets, net carrying amount	4,200
Healthcare Innovations
Indefinite-lived Intangible Assets [Line Items]
Intangible assets, net carrying amount	$ 15,700
Trade names
Indefinite-lived Intangible Assets [Line Items]
Estimated useful life	9 years 4 months 1 day	10 years 3 months
Customer Relationships
Indefinite-lived Intangible Assets [Line Items]
Estimated useful life	19 years 10 months
Non-compete agreements
Indefinite-lived Intangible Assets [Line Items]
Estimated useful life	3 years 1 month	2 years 1 month