Dispositions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Apr. 30, 2014 sqft Building
Real Estate Properties [Line Items]
Number of industrial buildings sold	20
Square feet of industrial buildings sold	2,800,000
Net proceeds from sale of industrial buildings to third-parties	$ 125.3
Atlanta [Member]
Real Estate Properties [Line Items]
Number of industrial buildings sold	1
Square feet of industrial buildings sold	1,300,000
Dallas [Member]
Real Estate Properties [Line Items]
Number of industrial buildings sold	5
Square feet of industrial buildings sold	900,000
Portland [Member]
Real Estate Properties [Line Items]
Number of industrial buildings sold	13
Square feet of industrial buildings sold	500,000
Tampa [Member]
Real Estate Properties [Line Items]
Number of industrial buildings sold	1
Square feet of industrial buildings sold	100,000