Financial Derivatives and Hedging Activities - Fair Value Amounts Recorded as Accumulated Other Comprehensive Income (Loss) (Detail) - Unrealized gain (loss) on cash flow hedges - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Fair Value Amounts Of Derivative Assets Recorded As A Component Of AOCI
Beginning balance	$ (3,460)	$ 5,859
Deferred gains (losses) on cash flow hedges	4,920	(1,435)
Reclassified to earnings	(74)	(5,015)
Ending balance	$ 1,386	$ (591)