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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Pension benefits [Member]        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 306 312 920 936
Expected return on plan assets (637) (612) (1,913) (1,836)
Amortization of prior service cost 0 0 0 0
Amortization of the net loss 230 236 690 708
Net periodic (increase) benefit cost (101) (64) (303) (192)
Other post-retirement benefits [Member]        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost 26 37 78 112
Interest cost 218 285 654 854
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of the net loss (169) 0 (507) 0
Net periodic (increase) benefit cost $ 75 $ 322 $ 225 $ 966