Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Property Buildings sqft	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Number of leased properties granting the tenants options to purchase the property	1
Amount of letters of credit and performance bonds in the aggregate	$ 17,585
Number of industrial properties committed to development	3
Gross leasable area (GLA) of industrial properties committed to development	800,000
Estimated total construction costs	35,200
Estimated total construction costs remaining to be funded	16,600
Operating and ground lease expense	$ 1,300	$ 1,440	$ 1,565