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Investments in Real Estate Entities - Expensed Acquisition, Development and Other Pursuit Costs and Impairment of Long-Lived Assets & Casualty Gains and Losses (Details)
3 Months Ended 9 Months Ended 15 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
land_parcel
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Equity method investment            
Business combination, acquisition related costs, abandoned pursuit costs $ 789,000 $ 2,170,000 $ 2,087,000 $ 3,522,000    
Impairment of investment in unconsolidated entities 0 0 0 0    
Casualty and impairment loss (gain), net 0 0 11,688,000 $ (3,935,000)    
Number of land parcels impaired | land_parcel       3    
Net operating real estate 15,767,760,000   15,767,760,000     $ 15,045,593,000
Insurance proceeds for property damage claims     13,268,000 $ 17,196,000    
Land            
Equity method investment            
Casualty and impairment loss (gain), net     9,350,000 10,500,000    
Avalon Maplewood            
Equity method investment            
Casualty and impairment loss (gain), net     2,338,000      
Casualty Loss     19,481,000      
Net operating real estate 16,361,000   16,361,000      
Other nonrecurring expense     3,120,000      
Insurance recoveries 19,696,000   17,143,000      
Insurance proceeds for property damage claims 7,076,000   13,268,000      
Gain on business interruption insurance recovery $ 3,495,000   $ 3,495,000      
Avalon at Edgewater            
Equity method investment            
Casualty and impairment loss (gain), net       8,702,000    
Insurance recoveries       29,008,000 $ 73,150,000  
Gain on business interruption insurance recovery       20,306,000    
New England            
Equity method investment            
Casualty and impairment loss (gain), net   (5,732,000)   5,732,000    
Casualty Loss   2,761,000   2,761,000    
Insurance recoveries   $ 8,493,000   $ 8,493,000