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Dispositions (Details) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
Seniors housing communities
property
Dec. 31, 2012
Seniors housing communities
property
Dec. 31, 2012
Skilled nursing facilities
property
Dec. 31, 2012
Medical office buildings
property
Dec. 31, 2012
2012 Dispositions
Seniors housing communities
property
Dec. 31, 2012
2012 Dispositions
Skilled nursing facilities
property
Dec. 31, 2012
2012 Dispositions
Medical office buildings
property
Dec. 31, 2012
2011 Dispositions
Dec. 31, 2012
2011 Dispositions
Seniors housing communities
property
Dec. 31, 2012
2011 Dispositions
Skilled nursing facilities
property
Dec. 31, 2010
2010 Dispositions
Seniors housing communities
property
Results of operations for all assets held-for-sale or disposed                                            
Number of real estate properties sold                               36 2 5   2 2 7
Proceeds from sale of real estate properties including termination fees                               $ 318,900,000   $ 27,200,000 $ 20,600,000     $ 60,500,000
Disposition of assets, termination fees                               5,000,000            
Gain from sale of assets                               81,000,000   4,500,000       17,300,000
Number of real estate properties sold, properties held in escrow                               21            
Proceeds from disposition of assets, exchanged in escrow account                               134,500,000            
Operating leases not renewed                       2                    
Lease termination fees                                           700,000
Properties classified as held for sale                         6 9 4              
Impairment of assets to be disposed of                 13,900,000                          
Revenues:                                            
Rental income                 21,511,000 26,196,000 19,583,000                      
Resident fees and services                 4,080,000 5,213,000 0                      
Interest and other income                 5,052,000 0 725,000                      
Total Revenues                 30,643,000 31,409,000 20,308,000                      
Expenses:                                            
Interest                 8,630,000 12,711,000 7,444,000                      
Depreciation and amortization                 38,793,000 12,040,000 5,382,000                      
Property-level operating expenses                 5,051,000 4,392,000 0                      
General, administrative and professional fees                 12,000 0 0                      
Other                 1,886,000 1,383,000 0                      
Total expenses                 54,372,000 30,526,000 12,826,000                      
(Loss) income before income taxes and gain on sale of real estate assets                 (23,729,000) 883,000 7,482,000                      
Income tax benefit                 4,000 477,000 0                      
Gain on real estate dispositions, net                 80,952,000 0 25,241,000                      
Discontinued operations $ (11,725,000) [1] $ (4,093,000) [1] $ 30,529,000 [1] $ 42,516,000 [1] $ (605,000) [2] $ (306,000) [2] $ 1,226,000 [2] $ 1,045,000 [2] $ 57,227,000 $ 1,360,000 $ 32,723,000                      
[1] The amounts presented for the three months ended March 31, 2012, June 30, 2012 and September 30, 2012 differ from the amounts previously reported in our Quarterly Reports on Form 10-Q as a result of discontinued operations consisting of properties sold in 2012 or classified as held for sale as of December 31, 2012.
[2] The amounts presented for the three months ended March 31, 2011, June 30, 2011, September 30, 2011 and December 31, 2011 differ from the amounts previously reported in our Annual Report on Form 10-K for the year ended December 31, 2011 as a result of discontinued operations consisting of properties sold in 2012 or classified as held for sale as of December 31, 2012.