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Pension and Post-Retirement Plans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension Benefits        
Components of net periodic (credit) expense:        
Interest cost $ 1,470 $ 1,516 $ 2,940 $ 3,032
Expected return on plan assets (3,906) (4,390) (7,812) (8,780)
Amortization of net actuarial loss 2,262 2,052 4,524 4,104
Net periodic (credit) expense (174) (822) (348) (1,644)
Post-Retirement Benefits        
Components of net periodic (credit) expense:        
Interest cost 160 175 320 350
Service cost 1 1 2 2
Amortization of prior-service costs (62) (62) (124) (124)
Amortization of net actuarial loss 81 96 162 192
Net periodic (credit) expense $ 180 $ 210 $ 360 $ 420