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Pension and Other Post-Retirement Benefits (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension Benefits        
Components of net periodic (credit) expense:        
Interest cost [1] $ 1,415 $ 1,271 $ 4,245 $ 3,814
Expected return on plan assets [1] (3,483) (4,035) (10,449) (12,106)
Amortization of prior-service costs [1] 0 0 0 0
Amortization of net actuarial loss [1] 2,509 1,795 7,526 5,386
Net periodic expense (credit) [1] 441 (969) 1,322 (2,906)
Post- Retirement Benefits        
Components of net periodic (credit) expense:        
Interest cost [1] 128 128 384 384
Expected return on plan assets [1] 0 0 0 0
Amortization of prior-service costs [1] (62) (62) (187) (186)
Amortization of net actuarial loss [1] 31 76 93 229
Net periodic expense (credit) [1] $ 97 $ 142 $ 290 $ 427
[1] Amounts are included in G&A expense on the Consolidated Statements of Income and Comprehensive Income.