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Employee benefits (Details 5) | 12 Months Ended
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Dec. 31, 2012 USD [Member] | Dec. 31, 2012 Euro [Member] | Dec. 31, 2012 Price Range One [Member] USD [Member] USD ($) | Dec. 31, 2012 Price Range One [Member] Euro [Member] EUR (€) | Dec. 31, 2012 Price Range Two [Member] USD [Member] USD ($) | Dec. 31, 2012 Price Range Two [Member] Euro [Member] EUR (€) | Dec. 31, 2012 Price Range Three [Member] USD [Member] USD ($) | Dec. 31, 2012 Price Range Three [Member] Euro [Member] EUR (€) | Dec. 31, 2012 Price Range Four [Member] USD [Member] USD ($) | Dec. 31, 2012 Price Range Four [Member] Euro [Member] EUR (€) | Dec. 31, 2012 Price Range Five [Member] USD [Member] USD ($) | Dec. 31, 2012 Price Range Five [Member] Euro [Member] EUR (€) | Dec. 31, 2012 Price Range Six [Member] USD [Member] USD ($) | Dec. 31, 2012 Price Range Six [Member] Euro [Member] EUR (€) | Dec. 31, 2012 Price Range Seven [Member] USD [Member] USD ($) | Dec. 31, 2012 Price Range Seven [Member] Euro [Member] EUR (€)
Outstanding stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of exercise prices, minimum |  |  | $ 0 | € 0 | $ 10 | € 10 | $ 15 | € 15 | $ 20 | € 20 | $ 25 | € 25 | $ 40 | € 40 | $ 50 | € 50
Range of exercise prices, maximum |  |  | $ 10 | € 10 | $ 15 | € 15 | $ 20 | € 20 | $ 25 | € 25 | $ 40 | € 40 | $ 50 | € 50 | $ 60 | € 60
Exercise Price Range, Number of Outstanding Options | 494,836 | 1,128,162 | 55,260 |  | 230,215 | 602,473 | 5,424 | 292,093 | 101,697 | 176,120 | 90,116 | 30,422 | 2,077 | 27,054 | 10,047 |
Weighted average remaining contractual life (years) | 3 years 4 months 28 days | 3 years 10 months 21 days | 2 years 9 months | 0 years | 1 year 7 months 21 days | 3 years | 5 years 9 months 18 days | 3 years 10 months 28 days | 4 years 5 months 27 days | 5 years 2 months 5 days | 6 years 1 month 28 days | 8 years 9 months 7 days | 8 years 7 months 28 days | 9 years 9 months 15 days | 9 years 8 months 12 days | 0 years

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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a, b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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