Investment in Real Estate - Additional Information (Details) $ in Thousands, ft² in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) ft² Property
Real Estate Properties [Line Items]
Number of industrial properties	516
Gross leasable area (GLA) of industrial properties | ft²	62.8
REIT Acquisition
Real Estate Properties [Line Items]
Number of industrial properties	1
Gross leasable area (GLA) of industrial properties | ft²	0.2
Purchase Price | $	$ 20,962
Ownership interest acquired	100.00%
Acquisition Activity
Real Estate Properties [Line Items]
Number of industrial properties	6
Gross leasable area (GLA) of industrial properties | ft²	0.9
Purchase Price | $	$ 158,974
Held For Sale Activity
Real Estate Properties [Line Items]
Number of industrial properties	8
Gross leasable area (GLA) of industrial properties | ft²	1.1
Number of land parcels held for sale	1
Disposition Activity
Real Estate Properties [Line Items]
Number of industrial properties	30
Gross leasable area (GLA) of industrial properties | ft²	1.9
Proceeds from sale of industrial properties | $	$ 99,279
Gain on sale of real estate | $	$ 52,140