Subsequent Events - Additional Information (Detail) (USD $)	12 Months Ended				2 Months Ended			0 Months Ended
	Dec. 31, 2013 Property	Dec. 31, 2012 Property	Dec. 31, 2011 Property	Dec. 31, 2013 Series F Preferred Stock	Feb. 27, 2014 Subsequent Event [Member] Parcels	Feb. 03, 2014 Subsequent Event [Member] Series F Preferred Stock	Feb. 03, 2014 Subsequent Event [Member] Series G Preferred Stock [Member]	Jan. 29, 2014 Unsecured Debt [Member] Subsequent Event [Member]	Jan. 29, 2014 London Interbank Offered Rate (LIBOR) [Member] Unsecured Debt [Member] Subsequent Event [Member]	Jan. 29, 2014 Series F Agreement Subsequent Event [Member]	Jan. 29, 2014 Series F Agreement Unsecured Debt [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Number of industrial properties acquired	2	1	1		1
Purchase price of acquisition	$ 73,642,000	$ 55,508,000	$ 5,277,000		$ 13,400,000
Number of industrial properties sold	67	28	36		1
Proceeds from sale of industrial property	126,250,000	82,503,000	75,953,000		1,335,000
Loan Principal								200,000
Loan Term								7 years
Basis points in addition to LIBOR									175.00%
Derivative, notional amount										200,000
Fixed interest rate converted from LIBOR											4.04%
Stock announced to be redeemed, shares						50,000	25,000
Redemption price per share				$ 1,000.00		$ 1,000.00	$ 1,000.00
Aggregate redemption price	$ (150,051,000)	$ (50,044,000)		$ 50,000,000		$ 50,000	$ 25,000