Discontinued Operations - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013 Agencies	Jun. 30, 2013 Agencies	Dec. 31, 2012 Agencies
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of care centers consolidated	19	28
Number of care centers closed			3
Number of care centers available for sale	34
Number of care centers sold	3	3
Number of care centers included in divestiture plan	50
Property Plant And Equipment Net	$ 156,887	$ 156,887	$ 156,709
Goodwill	209,260	209,260	209,594
Intangible Assets Net Excluding Goodwill	43,109	43,109	47,050
Assets Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property Plant And Equipment Net	500	500
Goodwill	700	700
Intangible Assets Net Excluding Goodwill	$ 300	$ 300
Home Health [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of care centers consolidated	17
Number of care centers available for sale	33
Number of care centers sold	2	2
Hospice [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of care centers consolidated	2
Number of care centers available for sale	1
Number of care centers sold	1	1