Indebtedness - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended					12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jul. 19, 2013	Dec. 14, 2011	Dec. 31, 2012 Mortgage Financing I - VI	Apr. 16, 2012 2012 Notes	Dec. 31, 2013 Unsecured Credit Facility	Dec. 31, 2013 Unsecured Debt	Dec. 31, 2012 Unsecured Debt	Dec. 31, 2013 Mortgages [Member]	Dec. 31, 2012 Mortgages [Member]
Debt Disclosure [Line Items]
Principal prepayments, prohibition period						12 months
Percentage of outstanding balance for calculating prepayment premium						1.00%
Mortgage loans paid off and retired prior to maturity											$ 72,261	$ 14,112
Loss from Retirement of Debt	(6,637)	(9,684)	(5,459)						5,003	9,323	1,578	361
Carrying value of industrial properties held under mortgage											826,754
Unamortized debt issue discount									28	598
Unamortized deferred financing cost, wrote off	56								191	728
Unamortized settlement amount of interest rate protection agreements									1,116	3,247
Professional service fee									0	440
Amount of notes paid off and retired at maturity							61,829
Line of credit facility, maximum borrowing capacity				625,000	450,000
Line of credit facility, increase, additional borrowings								$ 825,000
Number of years of extension of line of credit facility at election	1 year
Line of credit facility, interest rate description	150