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Summary of Significant Accounting Policies (Details)
$ in Thousands, shares in Millions, ft² in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
ft²
financing_receivable
state
variable_interest_entity
joint_venture
property
building
note_receivable
shares
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Business Overview:      
Gross investment amount, total $ 13,900,000    
Number of real estate properties | property 681    
Number of owned real estate properties | property 681    
Number of states that the company owns real estate in, whole units | state 35    
Approximate square feet invested in by company | ft² 39.9    
Approximate square feet for which Nationwide property management services provided by company | ft² 39.5    
Number of buildings owned by joint venture with TIAA | building 34    
Number of variable interest entities | variable_interest_entity 3    
Equity ownership for consolidation (percent) 100.00%    
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Number of variable interest entities | variable_interest_entity 3    
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests [Abstract]      
Redeemable non-controlling interests $ 2,000   $ 2,014
Leases [Abstract]      
Credit loss reserves $ 5,196   $ 0
Number of recognized lease financial receivables | financing_receivable 2    
Income from financing receivables $ 1,500    
Number of real estate notes receivable | financing_receivable 2    
Financing receivable, nonaccrual $ 54,100    
Variable Interest Entity      
Business Overview:      
Number of variable interest entities | variable_interest_entity 3    
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Number of variable interest entities | variable_interest_entity 3    
Number of notes receivable | note_receivable 2    
Number of joint ventures | joint_venture 1    
Non-Controlling Interest Holders | Healthcare Trustof America Holdings L P      
Business Overview:      
Limited partner's capital, units outstanding (in shares) | shares 4.7    
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Limited partner's capital, units outstanding (in shares) | shares 4.7    
Limited partners ownership interest (in percent) 1.20%    
Property Entities Not Determined to be VIEs      
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Equity interest owned (percent) 100.00%    
Healthcare Trustof America Holdings L P      
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Equity interest owned (percent) 98.80%    
Real Estate Properties Held in Joint Ventures      
Business Overview:      
Joint venture ownership (percent) 44.00%    
Notes Receivable      
Leases [Abstract]      
Interest income $ 2,000 $ 2,000