Investment in Real Estate - Additional Information (Detail) $ in Thousands, ft² in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) ft² Property	Dec. 31, 2014 USD ($) ft² Property	Dec. 31, 2013 USD ($) ft² Property
Real Estate [Line Items]
Number of industrial properties acquired | Property	8	8	2
Number of industrial properties acquired through acquisition of equity interest | Property			1
Equity interest acquired			100.00%
Gross leasable area (GLA) of industrial properties acquired | ft²	1.9	1.1	1.1
Purchase price of acquisitions	$ 169,218	$ 95,692	$ 72,812
Number of Days After Acquisiton Date	180 days
Number of Industrial Properties Held for Sale | Property	1
Square Footage of Industrial Properties Held for Sale | ft²	0.2
Number of industrial properties sold | Property	66	29	67
Gross leasable area (GLA) of industrial properties sold | ft²	3.8	2.0	3.0
Proceeds from sale of industrial properties	$ 158,429	$ 102,596	$ 144,628
Gain on sale of real estate	48,906	25,905	35,444
Gain on sale of real estate included in discontinued operations	$ 0	$ 25,988	$ 34,344
Number of sold industrial properties included in discontinued operations | Property	0	29	67
Impairment of Real Estate	$ 626	$ 0	$ 2,652
Impairment of Long-Lived Assets to be Disposed of			$ 2,652
Series of Individually Immaterial Business Acquisitions [Member]
Real Estate [Line Items]
Number of industrial properties acquired | Property	6
Purchase price of acquisitions	$ 122,913