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Organization of The Parent Company and The Operating Partnership (Textual) (Details)
 9 Months Ended
Sep. 30, 2019
a
ft²
parcel
property
Organization of The Parent Company and The Operating Partnership [Line Items]  
Number of properties | property 95
Net rentable area (in square feet) 16,711,387
Unconsolidated Properties  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Number of properties | property 10
Parent Company  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Areas of land held for development (in acres) | a 234.7
Area of land held for sale (in acres) | a 35.2
Area of additional undeveloped parcels of land with option to purchase (in acres) | a 55.5
Total potential development capacity (in square feet) 14,200,000
Parent Company | Land Parcel One  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Lease agreement term 99 years
Parent Company | Land Parcel Two  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Lease agreement term 99 years
Parent Company | Assets Held-for-sale  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Total potential development capacity (in square feet) 200,000
Parent Company | Leashold Interest Land  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Areas of land held for development (in acres) | a 1.8
Number of parcels of land | parcel 2
Wholly-owned Management Company Subsidiaries  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Net rentable area (in square feet) 24,600,000
Wholly-owned Management Company Subsidiaries | Wholly Owned Properties  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Net rentable area (in square feet) 16,700,000
Wholly-owned Management Company Subsidiaries | Partially Owned Properties  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Net rentable area (in square feet) 7,900,000
Brandywine Operating Partnership LP  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Ownership in the operating partnership 99.40%