Acquisitions and Dispositions (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Schedule of Acquisitions and Disposals [Line Items]
Aggregate purchase price	$ 0	$ 1,053,000
Date entered into an equity interest agreement	May 31, 2011
Percentage of equity agreed to acquire (in hundredths)	100.00%
Number of communities currently leased to Horizon By from HCP, Inc.	33
Number of communities currently leased from HCP, Inc. that will be owned and operated through joint venture with HCP, Inc.	21
Number of communities that will be leased from HCP, Inc	12
Percentage of interest acquired in joint venture	10.00%
Management agreement of joint venture (in years)	10
Number of five-year renewal options under the management agreement	4
Number of communities leased from HCP subject to long term, triple net leases	12
Number of communities that are provided management services from acquired company	57
Number of communities owned by company being acquired that are managed by third party	45
Number of communities owned by company being acquired that are managed by other third parties	3
The date the acquisition is expected to close	September 1, 2011
Twelve Assisted Living Communities [Member]
Schedule of Acquisitions and Disposals [Line Items]
Date of acquisition or disposition	January 13, 2011
Number of facilities purchased or sold	12
Aggregate purchase price	31,300,000
One (Real Estate Interest) Assisted Living Community [Member]
Schedule of Acquisitions and Disposals [Line Items]
Date of acquisition or disposition	February 1, 2011
Number of facilities purchased or sold	1
Aggregate purchase price	9,800,000
One Assisted Living Community [Member]
Schedule of Acquisitions and Disposals [Line Items]
Date of acquisition or disposition	February 1, 2011
Number of facilities purchased or sold	1
Aggregate purchase price	9,200,000
Three Home Health Facilities [Member]
Schedule of Acquisitions and Disposals [Line Items]
Number of facilities purchased or sold	3
Aggregate purchase price	4,200,000
Three Communities sold [Member]
Schedule of Acquisitions and Disposals [Line Items]
Number of facilities purchased or sold	3
Aggregate selling price of community or agency	$ 29,000,000