Organization and Business (Details)	6 Months Ended
Jun. 30, 2015 Investment
Organization and Business [Abstract]
Other series owned by the entity	1

Number of other investment series owned by the entity during the period.

No definition available.

Name:	gaifb_OtherSeriesOwnedByEntity
Namespace Prefix:	gaifb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration