Nature of Operations Consolidation and Presentation of Financial Statements - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) Agencies	Mar. 31, 2015	Dec. 31, 2015 USD ($)
Organization And Nature Of Operations [Line Items]
Percent Of Net Services Revenue Provided By Medicare	79.00%	81.00%
Number Of States With Facilities	34
Minimum percent ownership for controlling interest percent	50.00%
Equity Method Investment Aggregate Cost | $	$ 25.4		$ 25.7
Maximum Percent Ownership For Equity Method Percent	50.00%
Maximum Percent Ownership For Cost Method Percent	20.00%
Home Health [Member]
Organization And Nature Of Operations [Line Items]
Operating Care Centers	329
Hospice [Member]
Organization And Nature Of Operations [Line Items]
Operating Care Centers	79
Personal Care [Member]
Organization And Nature Of Operations [Line Items]
Operating Care Centers	9