Indebtedness - Additional Information (Detail) (USD $)	12 Months Ended				12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 14, 2011	Dec. 31, 2013 Mortgage Financing I-V	Dec. 31, 2013 Unsecured Credit Facility [Member]	Jul. 19, 2013 Unsecured Credit Facility [Member]	Dec. 31, 2013 Senior Unsecured Notes [Member]	Dec. 31, 2012 Senior Unsecured Notes [Member]	Apr. 16, 2012 2012 Notes	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 premiums					1.00%
Mortgage loans paid off and retired prior to maturity											$ 64,395,000	$ 14,112,000
Write-off of Unamortized Settlement Amounts of Interest Rate Protection Agreements	(6,423,000)	(9,684,000)	(5,299,000)					5,003,000	9,323,000		1,364,000	361,000
Carrying value of industrial properties held under mortgage											729,348,000
Unamortized debt issue discount								28,000	598,000
Unamortized deferred financing cost, wrote off	56							191,000	728,000
Unamortized settlement amount of interest rate protection agreements								1,116,000	3,247,000
Professional services fees								0	440,000
Amount of notes paid off and retired at maturity										61,829,000
Amount of Unsecured Revolving Credit Agreement				450,000,000			625,000,000
Increase in borrowing capacity under Unsecured Credit Facility						$ 825,000,000
Number of years of extension of line of credit facility at election	1 year
Line of credit facility, interest rate description	150