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Commitments and Contingencies - Summary of Properties Under Contracts (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
a
ft²
property
Third-party seller  
Real Estate Properties [Line Items]  
Number of Buildings | property 11
Area of real estate property | ft² 360,727
Purchase price $ 120,900
Assumed debt $ 0
Improved land parcels  
Real Estate Properties [Line Items]  
Number of Buildings | property 17
Area of real estate property | ft² 13,000,000.0
Los Angeles | Third-party seller  
Real Estate Properties [Line Items]  
Number of Buildings | property 7
Area of real estate property | ft² 82,884
Purchase price $ 23,525
Assumed debt $ 0
Northern New Jersey/New York City | Third-party seller  
Real Estate Properties [Line Items]  
Number of Buildings | property 2
Area of real estate property | ft² 195,598
Purchase price $ 84,525
Assumed debt $ 0
Northern New Jersey/New York City | Improved land parcels | Third-party seller  
Real Estate Properties [Line Items]  
Number of Buildings | property 1
Area of real estate property | a 2.0
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 2
Area of real estate property | ft² 82,245
Purchase price $ 12,850
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