Discontinued Operations and Assets Held For Sale - Additional Information (Detail) - Agencies	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013
Home Health [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of care centers consolidated		21	41
Number of care centers closed		22	10
Number of care centers available for sale	28	0	3
Number of care centers sold			19
Number of care centers included in discontinued operations			32
Home Health [Member] | Assets Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of care centers consolidated		1
Number of care centers sold		2
Hospice [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of care centers consolidated		4	5
Number of care centers closed		4
Number of care centers sold			1
Number of care centers included in discontinued operations			1