Nature of Operations Consolidation and Presentation of Financial Statements - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) Agencies	Mar. 31, 2016	Dec. 31, 2016 USD ($)
Organization And Nature Of Operations [Line Items]
Number Of States With Facilities	34
Minimum percent ownership for controlling interest percent	50.00%
Equity Method Investment Aggregate Cost | $	$ 27.8		$ 27.8
Maximum Percent Ownership For Equity Method Percent	50.00%
Maximum Percent Ownership For Cost Method Percent	20.00%
Medicare Revenue [Member]
Organization And Nature Of Operations [Line Items]
Percent Of Net Services Revenue Provided By Medicare	75.00%	79.00%
Home Health [Member]
Organization And Nature Of Operations [Line Items]
Operating Care Centers	326
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	16