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Income Taxes (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Tax effects of temporary differences and carryforwards included in the net deferred tax liabilities      
Property, primarily differences in depreciation and amortization, the tax basis of land assets and the treatment of interests and certain costs $ (310,756,000) $ (332,111,000) $ (287,165,000)
Operating loss and interest deduction carryforwards 366,590,000 343,843,000 103,733,000
Expense accruals and other 13,984,000 11,511,000 3,093,000
Valuation allowance (326,837,000) (281,954,000) (60,994,000)
Net deferred tax liabilities 257,019,000 [1] 258,711,000 [1] 241,333,000 [1]
Deferred tax assets 2,700,000 2,000,000  
Increase (decrease) in net deferred tax liability (1,700,000) 17,400,000  
Net difference between tax bases and the reported amount of REIT assets and liabilities 5,100,000,000 5,300,000,000  
Period during which subject built-in gains tax (in years) 10 years    
NOL carryforward related to TRS entities 289,000,000    
NOL carryforward related to REIT 692,000,000    
NHP
      
Business acquisition      
Net operating loss, carryforward   38,700,000  
Atria Senior Living Acquisition [Member]
      
Business acquisition      
Net operating loss, carryforward   $ 546,800,000  
[1] 2012 and 2011 includes approximately $2.7 million and $2.0 million, respectively, of deferred tax assets included in other assets on our Consolidated Balance Sheets.