Commitments and Contingencies - Additional Information (Details) ft² in Thousands, $ in Thousands	Jun. 30, 2017 USD ($) ft² Property	Apr. 03, 2017 USD ($) ft²	Dec. 31, 2016 ft²
Other Commitments [Line Items]
Number of industrial properties under construction | Property	6
Gross leasable area (GLA) of industrial properties under construction | ft²	900
Estimated total investment | $	$ 86,700
Estimated total investment remaining to be funded | $	$ 48,000
Gross leasable area (GLA) of industrial properties destroyed by fires | ft²	63,300
2016 Fire
Other Commitments [Line Items]
Gross leasable area (GLA) of industrial properties destroyed by fires | ft²			30
2017 Fire
Other Commitments [Line Items]
Gross leasable area (GLA) of industrial properties destroyed by fires | ft²		80
Insurance deductible | $		$ 25
Write off of unamortized net book value of building improvements | $		$ 8,246