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Income taxes - examination by major tax jurisdictions (Detail)	12 Months Ended
	Dec. 31, 2014
United States | Beginning
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2010
United States | Ending
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2014
Canada | Beginning
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2005
Canada | Ending
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2014
China | Beginning
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2009
China | Ending
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2014
Czech Republic | Beginning
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2011
Czech Republic | Ending
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2014
France | Beginning
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2012
France | Ending
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2014
Germany | Beginning
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2007
Germany | Ending
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2014
India | Beginning
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2008
India | Ending
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2014
Ireland | Beginning
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2010
Ireland | Ending
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2014
Italy | Beginning
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2010
Italy | Ending
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2014
Malaysia | Beginning
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2010
Malaysia | Ending
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2014
Singapore | Beginning
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2010
Singapore | Ending
Income Tax Examination [Line Items]
Taxable years remain subject to examination	2014

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- Definition

Tax year that remains open to examination under enacted tax laws, in CCYY format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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