Acquisitions and Disposals - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) Agency
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 20,800
Cash paid for acquisitions, primarily goodwill and intangible assets	20,259
Other	273
Deferred Tax Liabilities, Goodwill	$ 800
Home health services
Business Acquisition [Line Items]
Number of entities acquired | Agency	11
Halcyon Hospice
Business Acquisition [Line Items]
Other	$ 600
Home health reporting unit [Member]
Business Acquisition [Line Items]
Goodwill, Acquired During Period	$ 6,200
Hospice reporting unit
Business Acquisition [Line Items]
Number of entities acquired | Agency	9
Goodwill, Acquired During Period	$ 7,800
Community-based services
Business Acquisition [Line Items]
Number of entities acquired | Agency	1
Goodwill, Acquired During Period	$ 800