Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Interest Expense and Amortization of Deferred Debt Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Interest incurred	$ 49,322	$ 46,867	$ 45,898
Amortization of deferred debt costs	1,392	1,343	1,433
Capitalized interest	(3,489)	(2,527)	(2,166)
Total	$ 47,225	$ 45,683	$ 45,165