Acquisitions (Detail) $ in Millions	2 Months Ended	3 Months Ended				7 Months Ended	8 Months Ended	9 Months Ended	10 Months Ended	12 Months Ended
	Mar. 01, 2016 USD ($) Agencies	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jul. 24, 2015 USD ($) Agencies	Sep. 01, 2016 USD ($) Agencies	Oct. 03, 2015 USD ($) Agencies	Oct. 20, 2016 USD ($) Agencies	Dec. 31, 2016 USD ($) Y	Dec. 31, 2015 USD ($) Agencies Y
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Additions										$ 27.1	$ 56.1
Weighted-average amortization period										1 year 10 months 24 days
Adjustments related to acquisitions										$ 0.1
Long Term Debt		$ 93.0								93.0	96.6
Promissory Notes [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Long Term Debt		0.7								0.7	0.0
Home Health [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Additions										4.4	50.6
Adjustments related to acquisitions										0.1
Hospice [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Additions										0.0	5.5
Adjustments related to acquisitions										0.0
Personal Care [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Additions										22.7	0.0
Adjustments related to acquisitions										0.0
Florida [Member] | Infinity HomeCare [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
Adjustments related to acquisitions										$ 0.1
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
Massachusetts [Member] | Associated Homecare [Member] | Personal Care [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Acquisition, total purchase price	$ 27.7
Acquisition, number of care centers acquired | Agencies	9
Additions					$ 23.5
Acquisition, recorded other assets and liabilities				$ 0.2	$ 4.2
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	$ 0.5
Adjustments related to acquisitions				(5.0)
Massachusetts [Member] | Associated Homecare [Member] | Personal Care [Member] | Acquired Name Of Business [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Acquisition, other intangibles recorded				3.5
Massachusetts [Member] | Associated Homecare [Member] | Personal Care [Member] | Noncompete Agreements [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Acquisition, other intangibles recorded				$ 1.3
Massachusetts [Member] | Professional Profiles [Member] | Personal Care [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Acquisition, total purchase price							$ 4.4
Acquisition, number of care centers acquired | Agencies							4
Additions			$ 4.2
Period in which goodwill is expected to be deductible for income tax purposes, in years | Y										15
Massachusetts [Member] | Professional Profiles [Member] | Personal Care [Member] | Promissory Notes [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Long Term Debt							$ 0.7
Massachusetts [Member] | Professional Profiles [Member] | Personal Care [Member] | Noncompete Agreements [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Acquisition, other intangibles recorded			$ 0.2
New York [Member] | Home Health [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Acquisition, total purchase price		4.4							$ 4.6
Acquisition, number of care centers acquired | Agencies									1
Period in which goodwill is expected to be deductible for income tax purposes, in years | Y										15
New York [Member] | Home Health [Member] | Certificates Of Need And Licenses [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Acquisition, other intangibles recorded		$ 0.2								$ 0.2