Nature of Operations Consolidation and Presentation of Financial Statements - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) Agencies States	Jun. 30, 2015	Jun. 30, 2016 USD ($) Agencies States	Jun. 30, 2015	Dec. 31, 2015 USD ($)
Organization And Nature Of Operations [Line Items]
Percent Of Net Services Revenue Provided By Medicare	78.00%	80.00%	78.00%	80.00%
Number Of States With Facilities | States	34		34
Minimum percent ownership for controlling interest percent	50.00%		50.00%
Equity Method Investment Aggregate Cost | $	$ 26.2		$ 26.2		$ 25.7
Maximum Percent Ownership For Equity Method Percent	50.00%		50.00%
Maximum Percent Ownership For Cost Method Percent	20.00%		20.00%
Home Health [Member]
Organization And Nature Of Operations [Line Items]
Operating Care Centers	328		328
Hospice [Member]
Organization And Nature Of Operations [Line Items]
Operating Care Centers	79		79
Personal Care [Member]
Organization And Nature Of Operations [Line Items]
Operating Care Centers	9		9