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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]        
Cumulative effect adjustment to equity   $ 5,206,291   $ 5,301,005
Resident fees and services   $ 142,814 $ 140,232  
RIDEA II        
Schedule of Equity Method Investments [Line Items]        
Investment ownership percentage   40.00% 40.00%  
Equity method investments $ 121,000      
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09        
Schedule of Equity Method Investments [Line Items]        
Cumulative effect adjustment to equity 79,000      
Impairment charge 30,000      
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 | RIDEA II        
Schedule of Equity Method Investments [Line Items]        
Fair value of equity method investments $ 107,000      
Ancillary service revenue | ASU 2014-09        
Schedule of Equity Method Investments [Line Items]        
Resident fees and services   $ 10,000 $ 10,000