Nature of Operations Consolidation and Presentation of Financial Statements - Additional Information (Detail)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2012 State	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012 State	Jun. 30, 2011	Dec. 31, 2011
Organization and Nature of Operations [Line Items]
Percent of net services revenue provided by Medicare	82.00%		84.00%	83.00%	85.00%
Medicare-certified home health care centers	437			437
Medicare-certified hospice agencies	93			93
Hospice inpatient units	2			2
Number of states with facilities	38			38
Number of care centers closed		3				29
Minimum percent ownership for controlling interest percent	50.00%			50.00%