Income Taxes (Details)	12 Months Ended
Dec. 31, 2012
Income Taxes [Abstract]
Change in amount of unrecognized tax expense due to unaware tax positions, period	12 months

Represents period of change in total amount of unrecognized tax expense due to unaware tax positions.

No definition available.

Name:	gaifb_ChangeInAmountOfUnrecognizedTaxExpenseDueToUnawareTaxPositionsPeriod
Namespace Prefix:	gaifb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration