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Employee benefits - Accumulated other comprehensive losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plans
Amounts recognized in accumulated other comprehensive losss:
Net loss	$ 288,882	$ 304,330
Accumulated other comprehensive loss	288,882	304,330	$ 290,327
OPEB Plan
Amounts recognized in accumulated other comprehensive losss:
Net loss	21,472	5,720
Accumulated other comprehensive loss	$ 21,472	$ 5,720	$ 24,079

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
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-Paragraph 14A
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- References

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (j)
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