Indebtedness - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended				0 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jan. 29, 2014 Interest Rate Swap	Jun. 30, 2014 Mortgages	Jan. 29, 2014 Unsecured Term Loan	Jun. 30, 2014 Mortgages	Jun. 30, 2014 Mortgages	Jun. 30, 2014 Senior Unsecured Notes
Debt Disclosure [Line Items]
Extinguishment of debt, amount								$ 35,637		$ 81,794
Gains (losses) on extinguishment of debt	(493)	(4,222)	(493)	(5,372)				493	493
Carrying value of industrial properties held under mortgage						677,089
Unsecured term loan, term							7 years
Unsecured term loan, face amount							200,000
Swaps, notional amount					$ 200,000