Earnings Per Share (Narrative) (Details) (Common Stock [Member])	9 Months Ended
Sep. 30, 2013
Common Stock [Member]
Debt Instrument [Line Items]
Distributions made to holders	0.7441

Weighted Average Number of Shares, Ratio for previous shareholders prior to Reorganization

No definition available.

Name:	aag_WeightedAverageNumberofSharesRatioforpreviousshareholderspriortoReorganization
Namespace Prefix:	aag_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration