Commitments and Contingencies - Summary of Properties Under Contracts (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) ft² property
Third-party seller
Real Estate Properties [Line Items]
Number of Buildings | property	0
Square Feet | ft²	0
Purchase Price (in thousands)	$ 7,275
Assumed Debt (in thousands)	$ 0
Improved land parcels
Real Estate Properties [Line Items]
Number of Buildings | property	22
Square Feet | ft²	13,100,000
Los Angeles | Third-party seller
Real Estate Properties [Line Items]
Number of Buildings | property	0
Square Feet | ft²	0
Purchase Price (in thousands)	$ 0
Assumed Debt (in thousands)	$ 0
Northern New Jersey/New York City | Third-party seller
Real Estate Properties [Line Items]
Number of Buildings | property	0
Square Feet | ft²	0
Purchase Price (in thousands)	$ 0
Assumed Debt (in thousands)	$ 0
San Francisco Bay Area | Third-party seller
Real Estate Properties [Line Items]
Number of Buildings | property	0
Square Feet | ft²	0
Purchase Price (in thousands)	$ 0
Assumed Debt (in thousands)	$ 0
Seattle | Third-party seller
Real Estate Properties [Line Items]
Number of Buildings | property	0
Square Feet | ft²	0
Purchase Price (in thousands)	$ 7,275
Assumed Debt (in thousands)	$ 0
Miami | Third-party seller
Real Estate Properties [Line Items]
Number of Buildings | property	0
Square Feet | ft²	0
Purchase Price (in thousands)	$ 0
Assumed Debt (in thousands)	$ 0
Washington D.C. | Third-party seller
Real Estate Properties [Line Items]
Number of Buildings | property	0
Square Feet | ft²	0
Purchase Price (in thousands)	$ 0
Assumed Debt (in thousands)	$ 0