Goodwill and Other Intangibles, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Indefinite-lived Intangible Assets [Line Items]
Disposal Group, Including Discontinued Operation, Goodwill	$ 1,500
Intangible Assets, Net (Excluding Goodwill)	134,610	$ 102,006
Amortization	2,100	$ 2,500	$ 1,900
Home-based services [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)	88,100
Hospice Entity [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)	32,000
Community-Based Services [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)	9,500
Facility-based services [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)	$ 5,000