Commitments and Contingencies - Additional Information (Detail) - Jun. 30, 2015 $ in Thousands, ft² in Millions	USD ($) ft² Property
Commitments and Contingencies Disclosure [Abstract]
Number of industrial properties under construction | Property	7
Gross leasable area (GLA) of industrial properties under construction | ft²	1.4
Estimated total investment	$ 102,300
Estimated total investment remaining to be funded	$ 53,900