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Pension and Other Postretirement Employee Benefit Plans - Narrative (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 0       $ 0  
Non-operating pension and other postretirment benefit (costs) income 1,531   $ 1,187   2,845 $ 2,466
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 1,334 $ 1,239 1,336 $ 1,419    
Supplemental Employee Retirement Plan [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Employer contribution         200  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 400       400  
Non Qualified Pension Plans            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 805   (14)   1,249 (3)
Pension Plan [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 1,415   $ 1,682   2,860 3,432
Employer contribution         $ 0 $ 0