Business combinations - Summary of Assumptions Used to Measure Accrued Pension Benefits (Detail)	Dec. 31, 2015	Feb. 27, 2015
Business Combinations [Abstract]
Discount rate	2.40%	1.70%
Rate of compensation increase	2.80%	3.00%
Pension increase	1.60%	1.80%
Turnover	2.00%	2.00%

Estimated rate of return used in the calculation of the defined pension benefit obligation.

No definition available.

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- Definition

Estimated rate of turnover used in the calculation of the defined pension benefit obligation.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

The interest rate used to adjust for the time value of money for the 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 (k)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ 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 (k)(2)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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