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Pension and Post-Retirement Plans (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Pension Benefits    
Components of net periodic (credit) expense:    
Interest cost $ 1,404 $ 1,470
Expected return on plan assets (4,073) (3,906)
Amortization of net actuarial loss 2,053 2,262
Net periodic (credit) expense (616) (174)
Post-Retirement Benefits    
Components of net periodic (credit) expense:    
Interest cost 144 160
Service cost   1
Amortization of prior-service costs (62) (62)
Amortization of net actuarial loss 68 81
Net periodic (credit) expense $ 150 $ 180