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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]    
Beginning balance $ (4,878) $ (5,840)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 828 525
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (1,194) 147
Net current-period other comprehensive income (loss) (366) 672
Ending balance (5,244) (5,168)
UnrealizedGainsLossesFromDefinedBenefitPensionAndPostretirementPlanItems [Member]    
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]    
Beginning balance (5,360) (5,580)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (9) 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 180 176
Net current-period other comprehensive income (loss) 171 176
Ending balance (5,189) (5,404)
Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member]    
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]    
Beginning balance 482 (260)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 837 525
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (1,374) (29)
Net current-period other comprehensive income (loss) (537) 496
Ending balance $ (55) $ 236