Real Estate Activities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Real Estate Capitalized Costs [Line Items]
Construction in progress	$ 97,575	$ 64,019
Land held for development	5,910	6,350
Deferred costs and other assets, net	93,800	75,450
Capitalized Construction and Development Activities [Member]
Real Estate Capitalized Costs [Line Items]
Construction in progress	97,575	64,019
Land held for development	5,910	6,350
Deferred costs and other assets, net	2,752	2,332
Total capitalized construction and development activities	$ 106,237	$ 72,701