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Commitments and Contingencies - Narrative (Details)
$ in Millions
Oct. 30, 2019
USD ($)
a
ft²
property
contract
Sep. 30, 2019
ft²
property
Third-party seller    
Other Commitments [Line Items]    
Number of properties   2
Area of real estate property | ft²   90,756
Third-party seller | Subsequent event    
Other Commitments [Line Items]    
Outstanding contracts with a third-party | contract 3  
Third-party purchaser | Subsequent event    
Other Commitments [Line Items]    
Outstanding contracts with a third-party | contract 1  
Industrial building | Third-party seller | Subsequent event    
Other Commitments [Line Items]    
Number of properties 3  
Area of real estate property | ft² 91,000  
Industrial building | Third-party purchaser | Subsequent event    
Other Commitments [Line Items]    
Number of properties 1  
Sales price | $ $ 7.5  
Sales price, book value | $ $ 6.0  
Improved land parcels    
Other Commitments [Line Items]    
Number of properties   18
Area of real estate property | ft²   13,400,000
Improved land parcels | Third-party seller | Subsequent event    
Other Commitments [Line Items]    
Number of properties 1  
Area of real estate property | a 0.9