Acquisitions (Detail) $ in Millions	7 Months Ended	9 Months Ended	12 Months Ended
	Jul. 24, 2015 USD ($) Agencies	Oct. 03, 2015 USD ($) Agencies	Dec. 31, 2015 USD ($) Agencies Y	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Additions			$ 56.1	$ 0.0	$ 1.0
Home Health [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Additions			50.6	0.0	0.1
Hospice [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Additions			5.5	$ 0.0	$ 0.9
Florida [Member] | Home Health [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Acquisition, total purchase price			$ 63.0
Acquisition, number of care centers acquired | Agencies			15
Additions			$ 50.2
Acquisition, other intangibles recorded			10.9
Acquisition, recorded other assets and liabilities			1.9
Goodwill deductible for income tax purposes			$ 47.6
Period in which goodwill is expected to be deductible for income tax purposes, in years | Y			15
Escrow deposit for indemnification purposes and working capital price adjustments			$ 3.2
Tennessee [Member] | Hospice [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Acquisition, total purchase price	$ 5.8
Acquisition, number of care centers acquired | Agencies	1
Additions	$ 5.5
Acquisition, other intangibles recorded	$ 0.3
Georgia [Member] | Home Health [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Acquisition, total purchase price		$ 0.3
Acquisition, number of care centers acquired | Agencies		1
Additions		$ 0.3