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Real Estate - Additional Information (Detail)
12 Months Ended
Jun. 29, 2021
USD ($)
shares
Mar. 15, 2021
USD ($)
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
Mar. 05, 2021
USD ($)
a
Dec. 31, 2019
USD ($)
Nov. 05, 2019
a
Real Estate Properties [Line Items]                
Lessee, operating lease, incremental borrowing rate     5.63%          
Finance lease, right-of-use asset, amortization       $ 104,000        
Finance lease, interest expense       362,800        
Total purchase price     $ 2,408,136,000 2,284,126,000 $ 2,124,796,000   $ 2,081,597,000  
Below market lease, carrying amount     23,300,000 23,300,000        
Below market lease, accumulated amortization     17,300,000 16,000,000        
Accretion income, intangible liabilities     1,300,000 1,400,000 1,400,000      
Leasehold Interest Contributed In Contribution Agreement                
Real Estate Properties [Line Items]                
Asset acquisition, consideration transferred $ 21,500,000              
Payments to acquire businesses, gross $ 700,000              
Lease acquisition costs                
Real Estate Properties [Line Items]                
Intangible assets gross carrying amount     10,700,000 11,000,000        
Intangible assets, accumulated amortization     9,200,000 9,100,000        
Amortization expense     $ 400,000 500,000 600,000      
Weighted-average amortization period     4 years 7 months 6 days          
Above Market Leases                
Real Estate Properties [Line Items]                
Intangible assets gross carrying amount     $ 600,000 600,000        
Intangible assets, accumulated amortization     194,800 161,800        
Amortization expense     $ 32,900 32,900 $ 43,600      
Weighted-average amortization period     6 years 3 months 18 days          
Below Market Leases                
Real Estate Properties [Line Items]                
Weighted-average amortization period     4 years 10 months 24 days          
2018 Acquisitions                
Real Estate Properties [Line Items]                
Total purchase price       $ 108,300,000        
Limited Partner | Leasehold Interest Contributed In Contribution Agreement                
Real Estate Properties [Line Items]                
Stock issued during period, shares, acquisitions | shares 469,740              
Contribution Agreement                
Real Estate Properties [Line Items]                
Business acquisition, transaction costs           $ 1,200,000    
Right-of-use asset obtained in exchange for finance lease liability   $ 19,400,000            
Finance lease, liability           $ 19,400,000    
Contribution Agreement | BF Saul Real Estate Investment Trust                
Real Estate Properties [Line Items]                
Area of land | a               10.3
Twinbrook Metro Station                
Real Estate Properties [Line Items]                
Stock issued during period, shares, acquisitions | shares       469,740,000        
Twinbrook Metro Station | Restricted Stock Units (RSUs)                
Real Estate Properties [Line Items]                
Stock issued during period, shares, acquisitions | shares     1,416,071,000          
Twinbrook Metro Station | Contribution Agreement | BF Saul Real Estate Investment Trust                
Real Estate Properties [Line Items]                
Area of land | a           6.8   6.8
Twinbrook Metro Station Leasehold Interest | Contribution Agreement | BF Saul Real Estate Investment Trust                
Real Estate Properties [Line Items]                
Area of land | a           1.3   1.3
Twinbrook Quarter                
Real Estate Properties [Line Items]                
Business acquisition, expenses reimbursed           $ 7,400,000