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Summary of significant accounting policies - Schedule of Useful Lives (Detail) | 12 Months Ended
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Dec. 31, 2012
Buildings [Member] | Minimum [Member] |
Foreign Currency Translation [Line Items] |
Useful life, in years | 25 years
Buildings [Member] | Maximum [Member] |
Foreign Currency Translation [Line Items] |
Useful life, in years | 33 years
Plant, equipment and instrumentation [Member] | Minimum [Member] |
Foreign Currency Translation [Line Items] |
Useful life, in years | 2 years
Plant, equipment and instrumentation [Member] | Maximum [Member] |
Foreign Currency Translation [Line Items] |
Useful life, in years | 10 years
Furniture and fixtures [Member] | Minimum [Member] |
Foreign Currency Translation [Line Items] |
Useful life, in years | 4 years
Furniture and fixtures [Member] | Maximum [Member] |
Foreign Currency Translation [Line Items] |
Useful life, in years | 8 years

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- Details
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Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration