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Investment fund (Details Textual) (Feeder Fund [Member], USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Net Asset Value | $ 105.9 | $ 120.4
Investment Owned In Percentage For Shares Issued | 97.95% | 98.03%
Common Stock, Shares, Issued | 79,335.7 | 93,094.3
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Description | "Class A", "Class A1" and "Class E" shares can be redeemed monthly by investors with 30 days' notice |
Common Class A [Member] |  |
Common Stock, Shares, Issued | 839.0 | 2,948.0
Common Class A1 [Member] |  |
Common Stock, Shares, Issued | 846.4 | 397.9
Common Class B [Member] |  |
Common Stock, Shares, Issued | 77,650.3 | 89,040.3
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount | $ 100 |
Common Class E1 [Member] |  |
Common Stock, Shares, Issued |  | 708.1

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- Definition Investment owned in percentage for shares issued during the period. + References No definition available. + Details
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- Definition Net asset value of the investment fund as of the balance sheet date. + References No definition available. + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The amount that would be paid, determined under the conditions specified in the contract, if as of the reporting date, the holder of the share has the right to redeem the shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 150 -Paragraph 27 -Subparagraph a -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 Describe the nature and terms of the financial instrument, and the rights and obligations embodied in the instrument. Include settlement alternatives, if any, in the contract and identify the entity that controls the settlement alternatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22026-110879 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 150 -Paragraph 26 -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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