Discontinued Operations - Additional Information (Detail)	3 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2012 Home Health	Dec. 31, 2011 Home Health	Dec. 31, 2011 Hospice care centers
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of care centers consolidated			3	27	5
Number of care centers closed	3	29	3	27	2
Number of prospective unopened locations, start-up process discontinued				2