Summary of Significant Accounting Policies - Narrative (Details) shares in Millions, ft² in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2024 USD ($) ft² property financing_receivable variable_interest_entity note_receivable state shares	Dec. 31, 2024 USD ($) ft² property financing_receivable variable_interest_entity loan note_receivable state reporting_unit joint_venture shares	Dec. 31, 2023 USD ($) loan financing_receivable	Dec. 31, 2022 USD ($)	Dec. 12, 2024 property	Dec. 31, 2021 USD ($)
Business Overview:
Gross investment, amount, total	$ 11,800,000,000	$ 11,800,000,000
Number of owned real estate properties | property	589	589			3
Number of states that the Company owns real estate in | state	33	33
Approximate square feet invested in by company | ft²	34.2	34.2
Number of properties | property	63	63
Principles of Consolidation:
Equity ownership for consolidation (percent)	100.00%	100.00%
Number of entities | variable_interest_entity	3	3
Segment Reporting:
Number of reporting units | reporting_unit		1
Real Estate Properties:
Elimination of real estate lease intangibles against accumulated depreciation		$ 167,700,000	$ 214,800,000	$ 133,600,000
Depreciation		$ 507,100,000	518,600,000	320,800,000
Maximum period up to which interest capitalize on properties in stabilization		1 year
Goodwill and Other Intangible Assets:
Impairment of goodwill		$ 250,500,000
Revenue from Contracts with Customers (Topic 606):
Revenue Received	$ 1,900,000	$ 1,900,000	1,900,000	1,500,000
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	4,778,000	4,778,000	3,868,000	2,014,000		$ 0
Real Estate Notes Receivable:
Real estate notes receivable, net	$ 127,624,000	$ 127,624,000	$ 173,614,000
Allowance for Credit Losses, Interest Income, Income from Real Estate Notes Receivable:
Number of mezzanine loans | loan		2	2
Credit loss reserves		$ 59,563,000	$ 5,196,000
Number of mortgage loans | loan		1
Number of recognized lease financial receivables | financing_receivable	2	2
Income from financing receivables		$ 8,400,000	$ 8,300,000	8,100,000
Number of real estate notes receivable | financing_receivable	1	1	2
Mezzanine loans
Allowance for Credit Losses, Interest Income, Income from Real Estate Notes Receivable:
Credit loss reserves		$ 46,800,000
Interest income	$ 4,000,000
Mortgage Receivable
Allowance for Credit Losses, Interest Income, Income from Real Estate Notes Receivable:
Credit loss reserves		16,800,000
Accrued interest		500,000
Notes Receivable
Allowance for Credit Losses, Interest Income, Income from Real Estate Notes Receivable:
Interest income		8,000,000	$ 8,800,000	$ 3,400,000
Financing receivable, nonaccrual	$ 14,900,000	$ 14,900,000
Variable Interest Entity
Principles of Consolidation:
Number of entities | variable_interest_entity	5	5
Number of notes receivable | note_receivable	4	4
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	4.6	4.6
Limited partners ownership interest (in percent)		1.30%
Property Entities Not Determined to be VIEs
Principles of Consolidation:
Equity interest owned (percent)	100.00%	100.00%
Healthcare Trustof America Holdings L P
Principles of Consolidation:
Equity interest owned (percent)	98.70%	98.70%
Interest Rate Swap
Fair Value of Derivative Financial Instruments:
Accumulated other comprehensive income (loss), net of tax	$ (1,200,000)	$ (1,200,000)	(10,700,000)
Level 3
Business Overview:
Number of owned real estate properties | property	9	9
Tenant and Capital Improvements
Real Estate Properties:
Fully depreciated tenant and capital improvements eliminated against accumulated depreciation		$ 3,000,000	0
At-market lease intangibles
Real Estate Properties:
Elimination of real estate lease intangibles against accumulated depreciation		$ 112,300,000	$ 51,700,000
Real Estate Properties Held In Joint Ventures Member
Business Overview:
Weighted average ownership interest (percent)	31.00%	31.00%