Derivative Instruments and Hedging Activities - Schedule of Pre-tax Effect of Derivative Financial Instruments on Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivatives in Cash Flow Hedging Relationships:
(Loss) gain recognized in accumulated other comprehensive income (loss)	$ (3,572)	$ 3,777	$ (5,525)	$ 15,893
Loss reclassified from accumulated other comprehensive income (loss) to interest expense	$ (349)	$ (383)	$ (1,204)	$ (2,234)