Components of Net Periodic Benefit Cost (Benefit Cost (Increase) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension benefits
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$ 0	$ 0
Interest cost	214	198
Expected return on plan assets	(864)	(807)
Amortization of prior service cost	0	0
Amortization of the net loss (gain)	0	118
Net periodic (benefit) cost	(650)	(491)
Other post-retirement benefits
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	7	9
Interest cost	111	106
Expected return on plan assets	0	0
Amortization of prior service cost	0	0
Amortization of the net loss (gain)	(326)	(268)
Net periodic (benefit) cost	$ (208)	$ (153)