Derivatives - Effect of Our Derivative Financial Instruments on Our Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income on Derivative Instruments	$ (5,300)	$ 5,200
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Interest Expense	(1,200)	(100)
Interest Expense	$ (15,898)	$ (14,901)