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Variable Interest Entities - Narrative (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2018
Mar. 31, 2018
USD ($)
property
Mar. 31, 2018
GBP (£)
Dec. 31, 2019
USD ($)
property
joint_venture
entity
loan
tenant
Dec. 31, 2017
Dec. 31, 2016
USD ($)
property
Dec. 31, 2018
USD ($)
Mar. 31, 2018
GBP (£)
property
Dec. 31, 2016
GBP (£)
property
Variable Interest Entity [Line Items]                  
Mezzanine       $ 27,752     $ 21,013    
Carrying value of exchange accommodation titleholder, carrying value       323,000          
Loans receivable, net       $ 190,579     $ 62,998    
VIE tenants-operating leases                  
Variable Interest Entity [Line Items]                  
Number of properties leased (in properties) | property       2          
Unconsolidated Variable Interest Entities                  
Variable Interest Entity [Line Items]                  
Number of unconsolidated joint ventures (in joint ventures) | joint_venture       5          
Number of VIE borrowers with marketable debt securities (in joint ventures) | joint_venture       1          
Number of VIE borrowers with debt securities and loan (in loans) | loan       1          
Number of VIE tenants (in tenants) | tenant       1          
CCRC OpCo                  
Variable Interest Entity [Line Items]                  
Ownership percentage (as a percent)       49.00%          
Waldwick                  
Variable Interest Entity [Line Items]                  
Ownership percentage (as a percent)       85.00%          
HCP Ventures V                  
Variable Interest Entity [Line Items]                  
Ownership percentage (as a percent)       51.00%          
Life Science JVs                  
Variable Interest Entity [Line Items]                  
Ownership percentage (as a percent)       99.00%          
DownREIT Partnerships                  
Variable Interest Entity [Line Items]                  
Controlling interest entity controlling ownership interest | entity       7          
MSREI MOB JV                  
Variable Interest Entity [Line Items]                  
Ownership percentage (as a percent) 51.00%     51.00%          
MMCG                  
Variable Interest Entity [Line Items]                  
Loss on consolidation   $ (41,000) £ (29)            
Tax benefit   3,000 2            
Total liabilities   $ 13,000           £ 9  
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure                  
Variable Interest Entity [Line Items]                  
Number of properties leased (in properties) | property       2          
Bridge Loan | MMCG                  
Variable Interest Entity [Line Items]                  
Loans receivable, net           $ 131,000     £ 105
Number of properties (in properties) | property   7       7   7 7
Period of call-option retained         3 years 3 years      
Loss on consolidation   $ (41,000) £ (29)            
Senior housing triple-net | Loan-seller financing                  
Variable Interest Entity [Line Items]                  
Mezzanine       $ 10,000          
Term of facility       5 years          
Senior housing triple-net | Loan-senior secured                  
Variable Interest Entity [Line Items]                  
Number of VIE tenants (in tenants) | tenant       7          
Watertown JV                  
Variable Interest Entity [Line Items]                  
Ownership percentage (as a percent)       95.00%          
Property, plant and equipment | MMCG                  
Variable Interest Entity [Line Items]                  
Total assets   114,000           £ 81  
Finite-lived intangible assets | MMCG                  
Variable Interest Entity [Line Items]                  
Total assets   $ 5,000           £ 4