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Components of Net Periodic Benefit Cost (Benefit Cost (Increase) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension benefits        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 250 299 750 899
Expected return on plan assets (737) (640) (2,211) (1,922)
Amortization of prior service cost 0 0 0 0
Amortization of the net loss (gain) 174 254 522 762
Net periodic (decrease) increase in benefit cost (313) (87) (939) (261)
Other post-retirement benefits        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost 19 20 59 60
Interest cost 178 209 534 628
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of the net loss (gain) (62) (206) (186) (620)
Net periodic (decrease) increase in benefit cost $ 135 $ 23 $ 407 $ 68