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Significant accounting policies - Property, Plant and Equipment (Details) | 12 Months Ended
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Dec. 31, 2013
Other equipment | Minimum |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 5 years
Other equipment | Maximum |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 10 years
Licensed motor vehicles | Minimum |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 5 years
Licensed motor vehicles | Maximum |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 10 years
Office and computer equipment |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 4 years
Buildings |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life | 10 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_
Data Type: | xbrli:durationItemType
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Period Type: | duration