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Commitments and Contingencies - Additional Information (Details)
ft² in Thousands, $ in Thousands
Sep. 30, 2017
USD ($)
ft²
Property
Apr. 03, 2017
ft²
Dec. 31, 2016
ft²
Other Commitments [Line Items]      
Number of industrial properties | Property 516    
Gross leasable area (GLA) of industrial properties | ft² 62,800    
Insurance deductible | $ $ 25    
Write off of unamortized net book value of building improvements | $ $ 8,830    
Development Activity      
Other Commitments [Line Items]      
Number of industrial properties | Property 9    
Gross leasable area (GLA) of industrial properties | ft² 2,700    
Estimated total investment | $ $ 192,600    
Estimated total investment remaining to be funded | $ $ 120,900    
2016 Fire      
Other Commitments [Line Items]      
Number of industrial properties | Property 1    
Gross leasable area (GLA) of industrial properties | ft²     30
2017 Fire      
Other Commitments [Line Items]      
Number of industrial properties | Property 1    
Gross leasable area (GLA) of industrial properties | ft²   80