Subsequent Events - Additional Information (Details) $ in Thousands, ft² in Millions	2 Months Ended	12 Months Ended
	Feb. 22, 2018 USD ($) ft² Property	Dec. 31, 2017 USD ($) ft² Property	Dec. 31, 2016 USD ($) ft² Property	Dec. 31, 2015 USD ($) ft² Property
Subsequent Event [Line Items]
Number of industrial properties | Property		488
Gross leasable area (GLA) of industrial properties | ft²		60.2
Acquisition Activity
Subsequent Event [Line Items]
Number of industrial properties | Property		8	6	8
Purchase price of industrial properties acquired		$ 174,209	$ 111,130	$ 169,218
Gross leasable area (GLA) of industrial properties | ft²		1.1	0.7	1.9
Subsequent Events
Subsequent Event [Line Items]
Severance Costs	$ 1,000
Gross leasable area (GLA) of industrial properties | ft²	1.3
Subsequent Events | Mortgage Loans Payable 2018
Subsequent Event [Line Items]
Extinguishment of debt, amount	$ 157,782
Subsequent Events | Private Placement Notes 2028
Subsequent Event [Line Items]
Private Placement Notes, face amount	$ 150,000
Private Placement Notes, interest rate	3.86%
Subsequent Events | Private Placement Notes 2030
Subsequent Event [Line Items]
Private Placement Notes, face amount	$ 150,000
Private Placement Notes, interest rate	3.96%
Subsequent Events | Acquisition Activity
Subsequent Event [Line Items]
Number of industrial properties | Property	1
Number of Land Parcels | Property	1
Purchase price of industrial properties acquired	$ 15,625