Investment in Real Estate - Additional Information (Details) $ in Thousands, ft² in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) ft² Property	Dec. 31, 2015 USD ($) Property	Dec. 31, 2014 USD ($) Property
Real Estate [Abstract]
Number of industrial properties held for sale	3
Gross leasable area (GLA) of industrial properties held for sale | ft²	0.1
Number of industrial properties sold	63	66	29
Number of industrial properties sold included in discontinued operations	0	0	29
Impairment of Real Estate | $	$ 0	$ 626	$ 0