Derivative Financial Instruments - Offsetting of Derivative Assets (Detail) - Zero Cost Collars [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Asset Derivatives, Gross amounts of recognized assets	$ 2,020	$ 2,036
Asset Derivatives, Net amounts of assets presented in the balance sheets	2,020	2,036
Asset Derivatives, Gross amounts not offset in the balance sheets, Cash collateral pledged	(2,060)
Asset Derivatives, Net amount	$ (40)	$ 2,036