Retirement Plans - Net Periodic Benefit Cost Recognized for Supplemental Retirement Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net pension cost included the following components:
Service cost-benefits earned during the period	$ 913	$ 2,225	$ 879
Interest cost on projected benefit obligation	898	1,014	1,131
Amortization of net obligation at transition	0	1	2
Amortization of prior service cost	(58)	(55)	(54)
Recognized net actuarial loss	254	9,309	408
Net periodic pension cost	$ 2,007	$ 12,494	$ 2,366