Derivatives - Effect of Our Derivative Financial Instruments on Our Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income on Derivative Instruments	$ (10,500)	$ 3,800	$ (15,800)	$ 8,900
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Interest Expense	(1,200)	(600)	(2,300)	(600)
Interest Expense	$ (15,554)	$ (15,982)	$ (31,452)	$ (30,883)