Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands			12 Months Ended
	Sep. 11, 2015	Jan. 29, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 10, 2015	Jul. 19, 2013
Debt Disclosure [Line Items]
Loss from Retirement of Debt			$ 0	$ (655)	$ (6,637)
Line of Credit Facility, Current Borrowing Capacity							$ 625,000
2014 Notes
Debt Disclosure [Line Items]
Extinguishment of Debt, Amount				81,794
2014 Unsecured Term Loan
Debt Disclosure [Line Items]
Unsecured Term Loan, Term		7 years
Unsecured Term Loan, Face Amount		$ 200,000
Debt Instrument, Interest Rate Terms			LIBOR plus 170 basis points
2015 Unsecured Term Loan
Debt Disclosure [Line Items]
Unsecured Term Loan, Term	7 years
Unsecured Term Loan, Face Amount	$ 260,000
Debt Instrument, Interest Rate Terms			LIBOR plus 160 basis points
Mortgages
Debt Disclosure [Line Items]
Extinguishment of Debt, Amount			$ 22,910	65,558
Loss from Retirement of Debt			0	$ 655
Carrying value of industrial properties held under mortgage			727,022
Unsecured Credit Facility
Debt Disclosure [Line Items]
Line of Credit Facility, Current Borrowing Capacity						$ 625,000
Line of credit facility, increase, additional borrowings			$ 900,000
Number of years of extension of line of credit facility at election			1 year
Line of credit facility, interest rate description			LIBOR plus 115 basis points
Interest Rate Swap
Debt Disclosure [Line Items]
Swaps, Notional Amount			$ 460,000