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Employee Benefit Plans - Accumulated Other Comprehensive Loss/(Income) Expects to Recognize as Components of Net Periodic Benefit Cost (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Retirement Plan  
Defined Benefit Plan Disclosure [Line Items]  
Net actuarial loss/(gain) $ 37,385
Prior service cost/(credit) 972
Net transition obligation 0
Expected amortization of defined benefit plan amounts from AOCI in next fiscal year 38,357
Retiree Health and Life Insurance Plans  
Defined Benefit Plan Disclosure [Line Items]  
Net actuarial loss/(gain) (960)
Prior service cost/(credit) (498)
Net transition obligation 0
Expected amortization of defined benefit plan amounts from AOCI in next fiscal year $ (1,458)