Commitments and Contingencies - Additional Information (Details) $ in Thousands, ft² in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) ft² Property	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Other Commitments [Line Items]
Number of industrial properties | Property	458
Outstanding amount of letters of credit and performance bonds in the aggregate	$ 18,573
Gross leasable area (GLA) of industrial properties | ft²	63.1
Operating and ground lease expense	$ 1,566	$ 1,419	$ 1,380
Leases with purchase options
Other Commitments [Line Items]
Number of industrial properties | Property	5
Development Activity
Other Commitments [Line Items]
Number of industrial properties | Property	7
Gross leasable area (GLA) of industrial properties | ft²	2.8
Estimated total investment	$ 189,400
Estimated total investment remaining to be funded	$ 140,300