Real Estate Activities - Summary of Capitalized Salaries, Commissions and Benefits, Real Estate Taxes and Interest (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Salaries and benefits | Development/Redevelopment Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost	$ 219		$ 431	$ 373	$ 825
Capitalized Real Estate Taxes [Member] | Development/Redevelopment Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost		$ 276
Interest | Development/Redevelopment Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost	770		191	804	294
Salaries, commissions and benefits | Leasing Activities [Member]
Real Estate Capitalized Costs [Line Items]
Real estate capitalized cost	$ 1,573		$ 1,409	$ 3,228	$ 2,829