Acquisitions and Disposals - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($) Agency
Business Acquisition [Line Items]
Business Acquisition Costs Of Acquired Entity Purchase Price	$ 4.2
Cash paid for acquisitions, primarily goodwill and intangible assets	3.9
Fair Value of the acquired intangible assets	$ 2.0
Home health services
Business Acquisition [Line Items]
Number of entities acquired | Agency	4
Goodwill	$ 0.6
Hospice services
Business Acquisition [Line Items]
Number of entities acquired | Agency	1
Goodwill	$ 1.4
Community-based services
Business Acquisition [Line Items]
Number of entities acquired | Agency	1
Goodwill	$ 0.2