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Investment funds (Details Textual) (USD $)	1 Months Ended
Investment funds (Details Textual) (USD $)	Apr. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Alpha 4X Feeder Fund [Member]
Schedule of Investments [Line Items]
Equity Participation In Percentage		49.61%	55.87%
Variable Interest Entity Investment Redemption Amount	$ 13,900,000
Redeemable Noncontrolling Interest, Equity, Carrying Amount	49,400,000
Alpha4X Latam Fundo de Investimento Multimercado [Member]
Schedule of Investments [Line Items]
Redeemable Noncontrolling Interest, Equity, Carrying Amount	$ 565,000

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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