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Summary of Significant Accounting Policies - Narrative (Details)
shares in Millions, ft² in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
ft²
property
variable_interest_entity
state
jointVenture
reporting_unit
note_receivable
building
shares
Dec. 31, 2021
USD ($)
property
Dec. 31, 2020
USD ($)
Jul. 20, 2022
USD ($)
Business Overview [Abstract]        
Gross investment, amount, total $ 14,100,000,000      
Real estate properties and mortgages | property 688      
Number of owned real estate properties | property 688      
Number of states that the Company owns real estate in | state 35      
Square footage of owned real estate properties | ft² 40.3      
Number of buildings | building 33      
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Equity ownership for consolidation (percent) 100.00%      
Number of entities | variable_interest_entity 3      
Segment Reporting [Abstract]        
Number of Reporting Units | reporting_unit 1      
Real Estate Properties [Abstract]        
Elimination of real estate lease intangibles against accumulated depreciation $ 133,600,000 $ 33,700,000    
Depreciation $ 320,800,000 $ 170,000,000 $ 162,400,000  
Maximum period up to which interest capitalize on properties in stabilization 1 year      
Land Held for Development [Abstract]        
Number of land parcels held for development | property 20 7    
Land held for development $ 74,300,000 $ 24,800,000    
Goodwill and Intangible Assets [Abstract]        
Goodwill 223,202,000 3,487,000   $ 219,715,000
Revenue from Contract with Customer [Abstract]        
Revenue Received $ 1,500,000 1,400,000    
Federal Income Taxes [Abstract]        
Percentage of distribution of taxable income for qualify as REIT 90.00%      
Unrecognized tax benefits, income tax penalties and interest expense $ 0 0 $ 0  
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests [Abstract]        
Redeemable non-controlling interests 2,014,000 $ 0    
Leases [Abstract]        
Investments in notes receivable $ 99,600,000      
Variable Interest Entity        
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Number of entities | variable_interest_entity 3      
Number of notes receivable | note_receivable 2      
Number of joint ventures | jointVenture 1      
Healthcare Trustof America Holdings L P | Non-Controlling Interest Holders        
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Limited partners capital account outstanding | shares 4.0      
Limited partners ownership interest (in percent) 1.10%      
Medical Office Building        
Business Overview [Abstract]        
Number of buildings | property 2 4    
Real Estate Properties Held In Joint Ventures Member        
Real Estate Properties [Line Items]        
Weighted average ownership interest (percent) 48.00%      
Business Overview [Abstract]        
Weighted average ownership interest (percent) 48.00%      
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) 98.90%      
Interest Rate Swap        
Derivative Instrument Detail [Abstract]        
Accumulated other comprehensive income (loss), net of tax $ 2,100,000 $ 10,000,000    
Tenant and Capital Improvements        
Real Estate Properties [Abstract]        
Fully depreciated tenant and capital improvements eliminated against accumulated depreciation 4,100,000 9,900,000    
Buildings and improvements        
Real Estate Properties [Abstract]        
Fully depreciated tenant and capital improvements eliminated against accumulated depreciation 7,100,000      
At Market Lease Intangibles        
Real Estate Properties [Abstract]        
Elimination of real estate lease intangibles against accumulated depreciation $ 19,600,000 $ 16,300,000