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Note Employee benefits (Accumulated other comprehensive loss expected to be recognized as components of net periodic benefit cost) (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Pension Plans
Defined Benefit Plan Disclosure
Prior service (cost) credit	$ 0
Net actuarial loss	23,506
OPEB Plan
Defined Benefit Plan Disclosure
Prior service (cost) credit	0
Net actuarial loss	$ 0

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+ References

No definition available.

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- Definition

Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

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