Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015 sqft Property
Commitments and Contingencies Disclosure [Abstract]
Number of industrial properties under construction	8
Gross leasable area (GLA) of industrial properties under construction	1,600,000
Estimated total investment	$ 106,500
Estimated total investment remaining to be funded	$ 59,700