Capitalized Interest - Summary of Interest Incurred, Capitalized and Expensed Included in Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest Expense [Abstract]
Interest cost incurred	$ 3,965	$ 3,856	$ 11,633	$ 11,219
Interest capitalized		532	396	1,194
Interest expense	$ 3,965	$ 3,324	$ 11,237	$ 10,025