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Pension and Post-Retirement Plans (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Pension Benefits    
Components of net periodic (credit) expense:    
Interest cost $ 1,470 $ 1,516
Expected return on plan assets (3,906) (4,390)
Amortization of net actuarial loss 2,262 2,052
Net periodic (credit) expense (174) (822)
Post-Retirement Benefits    
Components of net periodic (credit) expense:    
Interest cost 160 175
Service cost 1 1
Amortization of prior-service costs (62) (62)
Amortization of net actuarial loss 81 96
Net periodic (credit) expense $ 180 $ 210