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Commitments and Contingencies - Summary of Properties Under Contracts (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
USD ($)
ft²
property
Third-party seller  
Real Estate Properties [Line Items]  
Number of Buildings | property 2
Area of real estate property | ft² 90,756
Purchase price $ 21,575
Assumed debt $ 0
Improved land parcels  
Real Estate Properties [Line Items]  
Number of Buildings | property 18
Area of real estate property | ft² 13,400,000
Los Angeles | Third-party seller  
Real Estate Properties [Line Items]  
Number of Buildings | property 0
Area of real estate property | ft² 0
Purchase price $ 0
Assumed debt $ 0
Northern New Jersey/New York City | Third-party seller  
Real Estate Properties [Line Items]  
Number of Buildings | property 1
Area of real estate property | ft² 50,256
Purchase price $ 12,000
Assumed debt $ 0
San Francisco Bay Area | Third-party seller  
Real Estate Properties [Line Items]  
Number of Buildings | property 0
Area of real estate property | ft² 0
Purchase price $ 0
Assumed debt $ 0
Seattle | Third-party seller  
Real Estate Properties [Line Items]  
Number of Buildings | property 1
Area of real estate property | ft² 40,500
Purchase price $ 9,575
Assumed debt $ 0
Miami | Third-party seller  
Real Estate Properties [Line Items]  
Number of Buildings | property 0
Area of real estate property | ft² 0
Purchase price $ 0
Assumed debt $ 0
Washington D.C. | Third-party seller  
Real Estate Properties [Line Items]  
Number of Buildings | property 0
Area of real estate property | ft² 0
Purchase price $ 0
Assumed debt $ 0