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Pension and Post-Retirement Plans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Benefits        
Components of net periodic (credit) expense:        
Interest cost [1] $ 1,271 $ 1,404 $ 3,814 $ 4,211
Expected return on plan assets [1] (4,035) (4,073) (12,106) (12,217)
Amortization of net actuarial loss [1] 1,795 2,053 5,386 6,157
Net periodic (credit) expense [1] (969) (616) (2,906) (1,849)
Post-Retirement Benefits        
Components of net periodic (credit) expense:        
Interest cost [1] 128 144 384 433
Amortization of prior-service costs [1] (62) (62) (186) (187)
Amortization of net actuarial loss [1] 76 68 229 206
Net periodic (credit) expense [1] $ 142 $ 150 $ 427 $ 452
[1] Amounts are included in G&A expense on the Consolidated Statements of Income and Comprehensive Income.