Summary of Significant Accounting Policies - Narrative (Details)
9 Months Ended
Sep. 30, 2023
USD ($)
Segment
shares
Dec. 31, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]    
Net assets $ 8,650,208,000 $ 8,472,866,000
Net liabilities $ 4,157,415,000 3,911,550,000
Number of segments | Segment 1  
Loan placed on non accrual status, past due days 60 days  
Accounts receivable $ 13,100,000 18,200,000
Accounts receivable, deemed not probable of collection 2,300,000 3,200,000
Deferred rental revenue receivables 185,200,000 167,100,000
Deferred rent receivables, deemed not probable of collection 1,000,000 1,300,000
Goodwill impairment 0  
Provision for income taxes $ 0  
Outstanding forward sales agreements | shares 0  
Special Purpose Entity    
Summary Of Significant Accounting Policies [Line Items]    
Net assets $ 11,100,000 11,700,000
Net liabilities $ 4,500,000 $ 4,900,000