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Summary of Significant Accounting Policies - Narrative (Details)
shares in Millions, ft² in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
ft²
reporting_unit
financing_receivable
property
note_receivable
variable_interest_entity
state
joint_venture
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jan. 01, 2023
USD ($)
Jul. 20, 2022
USD ($)
Dec. 31, 2020
USD ($)
Business Overview:              
Gross investment, amount, total   $ 13,400,000,000          
Number of owned real estate properties | property   655          
Number of states that the Company owns real estate in | state   35          
Approximate square feet invested in by company | ft²   38.5          
Number of properties | property   33          
Principles of Consolidation:              
Equity ownership for consolidation (percent)   100.00%          
Number of entities | variable_interest_entity   4          
Segment Reporting:              
Number of reporting units | reporting_unit   1          
Real Estate Properties:              
Elimination of real estate lease intangibles against accumulated depreciation   $ 214,800,000 $ 133,600,000        
Depreciation   $ 518,600,000 320,800,000 $ 170,000,000      
Maximum period up to which interest capitalize on properties in stabilization   1 year          
Goodwill and Other Intangible Assets:              
Goodwill   $ 250,530,000 223,202,000     $ 247,043,000  
Revenue from Contracts with Customers (Topic 606):              
Revenue Received   $ 1,900,000 1,500,000 1,400,000      
Federal Income Taxes:              
Percentage of distribution of taxable income for qualify as REIT   90.00%          
Unrecognized tax benefits, income tax penalties and interest expense   $ 0 0 0      
Redeemable Non-Controlling Interests:              
Redeemable non-controlling interests   3,868,000 2,014,000 0     $ 0
Real Estate Notes Receivable:              
Real estate notes receivable, net   173,614,000 99,643,000        
Allowance for Credit Losses, Interest Income, Income from Real Estate Notes Receivable:              
Carrying value   173,614,000          
Credit loss reserves $ 5,200,000 $ 5,196,000 0        
Number of recognized lease financial receivables | financing_receivable   2          
Income from financing receivables   $ 8,300,000 8,100,000        
Financing receivable, nonaccrual         $ 48,900,000    
Notes Receivable              
Allowance for Credit Losses, Interest Income, Income from Real Estate Notes Receivable:              
Interest income   $ 8,800,000 3,400,000 $ 0      
Variable Interest Entity              
Principles of Consolidation:              
Number of entities | variable_interest_entity   3          
Number of notes receivable | note_receivable   2          
Number of joint ventures | joint_venture   1          
Healthcare Trustof America Holdings L P | Non-Controlling Interest Holders              
Principles of Consolidation:              
Limited partners capital account outstanding (in units) | shares   4.5          
Limited partners ownership interest (in percent)   1.20%          
Property Entities Not Determined to be VIEs              
Principles of Consolidation:              
Equity interest owned (percent)   100.00%          
Healthcare Trustof America Holdings L P              
Principles of Consolidation:              
Equity interest owned (percent)   98.80%          
Minimum              
Goodwill and Other Intangible Assets:              
Goodwill, purchase accounting adjustments   $ 27,300,000          
Maximum              
Goodwill and Other Intangible Assets:              
Goodwill   250,500,000 223,200,000        
Interest Rate Swap              
Fair Value of Derivative Financial Instruments:              
Accumulated other comprehensive income (loss), net of tax   (10,700,000) 2,100,000        
Tenant and Capital Improvements              
Real Estate Properties:              
Fully depreciated tenant and capital improvements eliminated against accumulated depreciation     4,100,000        
At Market Lease Intangibles              
Real Estate Properties:              
Elimination of real estate lease intangibles against accumulated depreciation   $ 51,700,000 $ 19,600,000        
Real Estate Properties Held In Joint Ventures Member              
Business Overview:              
Weighted average ownership interest (percent)   43.00%          
Number of properties | property   33