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 Units [Member]	Dec. 31, 2013 Series G Preferred Units [Member]	Feb. 27, 2014 Subsequent Events [Member] Property	Feb. 03, 2014 Subsequent Events [Member] Series F Preferred Units [Member]	Feb. 03, 2014 Subsequent Events [Member] Series G Preferred Units [Member]	Jan. 29, 2014 Unsecured Debt [Member] Subsequent Events [Member]	Jan. 29, 2014 London Interbank Offered Rate (LIBOR) [Member] Unsecured Debt [Member] Subsequent Events [Member]	Jan. 29, 2014 Interest Rate Swap [Member] Subsequent Events [Member]	Jan. 29, 2014 Interest Rate Swap [Member] Unsecured Debt [Member] Subsequent Events [Member]
Subsequent Event [Line Items]
Number of industrial properties acquired	2	1	1			1
Purchase price of acquisition	$ 73,642,000	$ 48,621,000	$ 5,277,000			$ 13,400,000
Number of industrial properties sold	65	26	34			1
Net Proceeds from Sales of Investments in Real Estate	120,674,000	80,362,000	71,083,000			1,335,000
Loan Principal									200,000
Loan term									7 years
Basis points in addition to LIBOR										175.00%
Notional amount of derivative											200,000
Fixed interest rate converted from LIBOR												4.04%
Stock announced to be redeemed, shares							50,000	25,000
Redemption price per depositary share				$ 1,000.00	$ 1,000.00		$ 1,000.00	$ 1,000.00
Aggregate redemption price							$ 50,000	$ 25,000