Subsequent Events - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		1 Months Ended
	Mar. 31, 2015 Property	Mar. 31, 2014	Apr. 29, 2015 Land_Parcel Property
Subsequent Event [Line Items]
Purchase price of land parcels acquired	$ 0	$ 13,262
Number of industrial properties sold	9
Proceeds from the sale of industrial properties and land parcels	26,626
Subsequent Events
Subsequent Event [Line Items]
Number of land parcels acquired			1
Purchase price of land parcels acquired			4,142
Number of industrial properties sold			1
Number of land parcels sold			1
Proceeds from the sale of industrial properties and land parcels			6,435
Settlement payment on Group II Swaps			$ 11,546