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Right of Presentment - Additional Information (Detail)	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Investing partner units value per unit	15,412	15,516

X

- Definition

Right of presentment valuation price per unit.

+ References

No definition available.

+ Details

Name:	aoip_RightOfPresentmentValuationPricePerUnit
Namespace Prefix:	aoip_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration