Real Estate Activities - Summary of Capitalized Salaries, Commissions and Benefits, Real Estate Taxes and Interest (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Salaries and benefits | Development/Redevelopment Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost	$ 309	$ 201	$ 683	$ 1,026
Capitalized Real Estate Taxes [Member] | Development/Redevelopment Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost	323	4	599
Interest | Development/Redevelopment Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost	758	201	1,562	494
Salaries, commissions and benefits | Leasing Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost	$ 1,610	$ 1,394	$ 4,837	$ 4,223