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Employee benefits - Additional information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 |
Savings Plans |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Savings Plans | 77,000,000 | 81,000,000 |
Savings Plans Contributions | $ 14,000,000.0 | $ 15,100,000 | $ 12,700,000
Savings Plans Stocks Held | 1,362,593 | 1,378,048 |
OPEB Plan |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Service cost | $ 713,000 | $ 759,000 | 1,028,000
Termination benefit cost | $ 0 | $ 0 | $ 1,790,000

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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. + Details
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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. + Details
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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 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(C) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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