Subsequent Events - Additional Information (Detail) $ in Thousands	1 Months Ended	6 Months Ended
	Aug. 03, 2015 USD ($) Land_Parcel Property	Jun. 30, 2015 USD ($) Land_Parcel Property
Subsequent Event [Line Items]
Number of industrial properties sold | Property		12
Number of land parcels sold | Land_Parcel		1
Proceeds from the sale of industrial properties and land parcels		$ 42,611
Subsequent Events
Subsequent Event [Line Items]
Number of industrial properties sold | Property	1
Number of land parcels sold | Land_Parcel	1
Proceeds from the sale of industrial properties and land parcels	$ 1,307