Pension and other postretirement benefits - expected benefit payments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Pension
Schedule Of Pension Expected Future Benefit Payments [Line Items]
2015	$ 17,841
2016	18,449
2017	19,023
2018	19,653
2019	20,472
Years 2020 — 2024	114,185
Other Benefits
Schedule Of Pension Expected Future Benefit Payments [Line Items]
2015	3,268
2016	3,362
2017	3,334
2018	3,367
2019	3,416
Years 2020 — 2024	$ 18,229

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Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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- Definition

Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan.

+ References

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Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

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