Nature of Operations Consolidation and Presentation of Financial Statements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014 States	Jun. 30, 2013	Jun. 30, 2014 States	Jun. 30, 2013	Dec. 31, 2013
Organization And Nature Of Operations [Line Items]
Percent Of Net Services Revenue Provided By Medicare	82.00%	84.00%	82.00%	84.00%
Number Of States With Facilities	33		33
Minimum percent ownership for controlling interest percent	50.00%		50.00%
Equity Method Investment Aggregate Cost	$ 15.0		$ 15.0		$ 11.9
Cost Method Investments	$ 5.0		$ 5.0		$ 5.0
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	316		316
Hospice [Member]
Organization And Nature Of Operations [Line Items]
Operating Care Centers	80		80
Hospice Inpatient [Member]
Organization And Nature Of Operations [Line Items]
Operating Care Centers	1		1