Pension and Employee Benefit Plans - Schedule of Net Periodic Benefit Cost For Pension Benefits Included in the Accompanying Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Interest cost	$ 1,034	$ 1,303	$ 1,190
Expected return on plan assets	(1,594)	(1,254)	(1,511)
Amortization of net loss	266	263	238
Net periodic benefit (income) cost	$ (294)	$ 312	$ (83)