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Components of Net Periodic Benefit Cost (Benefit Cost (Increase) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension benefits        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 302 214 604 428
Expected return on plan assets (706) (864) (1,412) (1,728)
Amortization of prior service cost 0 0 0 0
Amortization of the net loss (gain) 177 0 354 0
Net periodic (decrease) increase in benefit cost (227) (650) (454) (1,300)
Other post-retirement benefits        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost 3 7 6 14
Interest cost 150 111 300 222
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of the net loss (gain) (533) (326) (1,066) (652)
Net periodic (decrease) increase in benefit cost $ (380) $ (208) $ (760) $ (416)