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Variable Interest Entities and Investment in Unconsolidated Ventures - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2017
Jan. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Investment in Unconsolidated Joint Ventures [Line Items]          
Distributions from unconsolidated ventures from cumulative share of net earnings     $ 8,258 $ 23,544 $ 7,825
Equity method liability $ 49,500   $ 49,500 60,200  
CCRC Venture          
Schedule of Investment in Unconsolidated Joint Ventures [Line Items]          
Proceeds from debt financing       434,500  
Distributions from unconsolidated ventures from cumulative share of net earnings       $ 221,600  
Percentage ownership in unconsolidated joint ventures 51.00%   51.00%    
Sale of 10% ownership interest in the HCP 49 Venture          
Schedule of Investment in Unconsolidated Joint Ventures [Line Items]          
Percentage ownership in unconsolidated joint ventures   10.00%      
Proceeds from sale of investments   $ 26,800      
HCP 49 Venture          
Schedule of Investment in Unconsolidated Joint Ventures [Line Items]          
Percentage ownership in unconsolidated joint ventures 10.00%   10.00%    
Unconsolidated Ventures          
Schedule of Investment in Unconsolidated Joint Ventures [Line Items]          
Proceeds from sale of investments $ 36,000        
Gain on sale of assets, net     $ 9,400