Real Estate Activities - Summary of Capitalized Salaries, Commissions and Benefits, Real Estate Taxes and Interest (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Salaries and benefits | Development/Redevelopment Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost	$ 272	$ 193	$ 585	$ 675
Real estate taxes | Development/Redevelopment Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost	5	133	5	277
Interest | Development/Redevelopment Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost	331	325	620	1,430
Salaries, commissions and benefits | Leasing Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost	$ 1,180	$ 1,636	$ 3,902	$ 4,137