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Subsequent Events (Details) (Subsequent Event [Member], USD $)
In Millions, unless otherwise specified
1 Months Ended
May 14, 2015
Subsequent Event [Member]
 
Subsequent Event [Line Items]  
Fund subscriptions $ 1.3gaifb_FundSubscriptions
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Fund redemptions $ 0.1gaifb_FundRedemptions
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember