Derivative Instruments and Hedging Activities - Schedule of Pre-tax Effect of Derivative Financial Instruments on Unaudited Condensed Consolidated Statements of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivatives in Cash Flow Hedging Relationships:
Gain (loss) recognized in accumulated other comprehensive (loss) income	$ 187	$ 1,875	$ (5,338)	$ 17,768
Gain (loss) reclassified from accumulated other comprehensive (loss) income to interest expense	$ 324	$ (301)	$ (880)	$ (2,535)