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Pension and Post-Retirement Plans (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
May 31, 2017
Pension Benefits    
Components of net periodic (credit) expense:    
Interest cost $ 1,271 $ 1,404
Expected return on plan assets (4,035) (4,073)
Amortization of net actuarial loss 1,795 2,053
Net periodic (credit) expense (969) (616)
Post-Retirement Benefits    
Components of net periodic (credit) expense:    
Interest cost 128 144
Amortization of prior-service costs (62) (62)
Amortization of net actuarial loss 76 68
Net periodic (credit) expense $ 142 $ 150