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Employee benefits - Additional information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Transfers in or out of Level 1	$ 0	$ 0
Transfers in or out of Level 2	0	0
Transfers in or out of Level 3	0	0
Pension Plans
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Service cost	0	0	$ 0
Termination benefit cost	0	0	0
Pension Plans | ASU 2017-07
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Reclassification Other Components From Personnel To Other Operating Expenses			5,000,000.0
OPEB Plan
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Service cost	759,000	1,028,000	1,026,000
Termination benefit cost	0	1,790,000	0
OPEB Plan | ASU 2017-07
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Reclassification Other Components From Personnel To Other Operating Expenses			2,500,000
Savings Plans
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Savings Plans	81,000,000	70,400
Savings Plans Contributions	$ 15,100,000	$ 12,700,000	$ 10,000,000
Savings Plans Stocks Held	1,378,048	1,490,253

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- Definition

Reclassification other components of net benefit cost from personnel to other operating expenses.

+ References

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- Definition

Value of stock in an investment or savings plan established by the entity for the benefit of its employees that permits the employees to make investment decisions.

+ References

No definition available.

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- Definition

The amount of cash or cash equivalents contributed by the entity to fund its savings plans.

+ References

No definition available.

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- Definition

Number of shares of stock held by the plan.

+ References

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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- Definition

Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement.

+ References

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Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs.

+ References

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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