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Real Estate Properties - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
ft²
property
lease
Jun. 30, 2021
USD ($)
ft²
property
joint_venture
lease
Dec. 31, 2020
USD ($)
Real Estate Properties [Line Items]      
Rentable area of properties (in square feet) | ft² 877,000 877,000  
Real estate aggregate undepreciated carrying value | $ $ 3,847,964 $ 3,847,964 $ 3,522,143
Number of joint ventures | joint_venture   2  
Number of leases entered | lease 25 45  
Rentable square feet (in sqft) | ft² 548,000 1,123,000  
Weighted average lease term 16 years 7 months 6 days 10 years 10 months 24 days  
Expenditures committed on leases | $ $ 76,702 $ 83,847  
Committed but unspent tenant related obligations estimated | $ $ 113,099 $ 113,099  
Disposal Group, Held-for-sale, Not Discontinued Operations      
Real Estate Properties [Line Items]      
Number of properties | property 3 3  
Rentable area of properties (in square feet) | ft² 775,000 775,000  
Real estate held-for-sale | $ $ 41,236 $ 41,236  
Unconsolidated Joint Ventures      
Real Estate Properties [Line Items]      
Number of properties | property 3 3  
Rentable area of properties (in square feet) | ft² 444,000 444,000  
Number of buildings, noncontrolling interest | property   3  
Joint Venture 1      
Real Estate Properties [Line Items]      
Ownership percentage 51.00% 51.00%  
Joint Venture 2      
Real Estate Properties [Line Items]      
Ownership percentage 50.00% 50.00%  
Continuing operations      
Real Estate Properties [Line Items]      
Number of properties | property 181 181  
Rentable area of properties (in square feet) | ft² 24,091,000 24,091,000  
Real estate aggregate undepreciated carrying value | $ $ 3,889,200 $ 3,889,200