Nature of Operations Consolidation and Presentation of Financial Statements - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Agencies States	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Organization And Nature Of Operations [Line Items]
Percent Of Net Services Revenue Provided By Medicare	80.00%		82.00%	84.00%
Number Of States With Facilities | States	34
Minimum percent ownership for controlling interest percent	50.00%
Equity Method Investment Aggregate Cost	$ 25.7		$ 18.8
Cost Method Investments			5.0
Maximum Percent Ownership For Equity Method Percent	50.00%
Maximum Percent Ownership For Cost Method Percent	20.00%
Goodwill, Impairment Loss			0.0	$ (1.3)
Heritage Healthcare Innovation Fund [Member]
Organization And Nature Of Operations [Line Items]
Equity Method Investment Aggregate Cost	$ 19.9
Equity method investment current assets		$ 3.5
Equity method investment total assets		170.4
Equity method investment current liabilities		0.1
Equity method investment total liabilities		0.1
Equity method investment total investment income		72.5
Equity method investment summarized financial information total expenses		3.5
Equity method investment summarized financial information net increase in partners' capital from operations		$ 69.0
Equity Method Investments [Member]
Organization And Nature Of Operations [Line Items]
Goodwill, Impairment Loss				1.3
Home Health [Member]
Organization And Nature Of Operations [Line Items]
Operating Care Centers | Agencies	329
Goodwill, Impairment Loss			0.0	(1.3)
Hospice [Member]
Organization And Nature Of Operations [Line Items]
Operating Care Centers | Agencies	79
Goodwill, Impairment Loss			$ 0.0	$ 0.0