Investment in Real Estate - Additional Information (Details) $ in Thousands, ft² in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) ft² Property
Real Estate [Abstract]
Number of industrial properties acquired	4
Gross Leasable Area Acquired | ft²	0.5
Purchase price of land parcels acquired | $	$ 94,497
Number of industrial properties held for sale	3
Gross leasable area (GLA) of industrial properties held for sale | ft²	0.4
Number of land parcels held for sale	1
Number of industrial properties sold	20
Gross leasable area (GLA) of industrial properties sold | ft²	1.0
Proceeds from sale of industrial properties | $	$ 59,130
Gain on sale of real estate | $	$ 28,869