Benefit Plans - Reconciliation of Amounts in Accumulated Other Comprehensive Loss That Have Not Yet Been Recognized as Components of Net Periodic Benefit Cost (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($)
Actuarial loss
Actuarial Loss	$ (10,076)
Total within accumulated other comprehensive loss
Net periodic benefit cost, beginning balance	(156,524)
Reclassification Adjustments	5,021
Net periodic benefit cost, ending balance	(161,579)
Pension Plans
Actuarial loss
Actuarial loss, beginning balance	(146,762)
Actuarial Loss	(5,521)
Reclassification Adjustments	4,619
Actuarial loss, ending balance	(147,664)
Prior service costs
Prior service costs, beginning balance	(26)
Reclassification Adjustments	19
Prior service costs, ending balance	(7)
Postretirement Benefits
Actuarial loss
Actuarial loss, beginning balance	(9,736)
Actuarial Loss	(4,555)
Reclassification Adjustments	383
Actuarial loss, ending balance	$ (13,908)

Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Before Tax

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Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), Before Tax

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Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Before Tax

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net period benefit cost (credit) of defined benefit plan.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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