Derivatives - Effect of Our Derivative Financial Instruments on Our Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income on Derivative Instruments	$ (2,800)	$ 3,000	$ (18,600)	$ 11,200
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Interest Expense	(800)	(1,000)	(3,100)	(800)
Interest Expense	$ (15,534)	$ (15,181)	$ (46,986)	$ (46,064)