Donation of Redeemable Units to Limited Partners

No definition available.

Name:	acef_DonationOfRedeemableUnitsToLimitedPartners
Namespace Prefix:	acef_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Net Assets Value Per Unit Liquidation Circumstance

+ References

No definition available.

+ Details

Name:	acef_NetAssetsValuePerUnitLiquidationCircumstance
Namespace Prefix:	acef_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Partnership unit purchase.

+ References

No definition available.

+ Details

Name:	acef_PartnershipUnitPurchase
Namespace Prefix:	acef_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Partnership unit purchase fair value.

+ References

No definition available.

+ Details

Name:	acef_PartnershipUnitPurchaseFairValue
Namespace Prefix:	acef_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents the excess of the cost (face amount, notional amount) of an investment (security, contract) over its fair value which deficiency has not been recognized in earnings of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-INV

-Section Glossary

-IssueDate 2008-05-01

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Date the entity is scheduled to be liquidated, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LiquidationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of units sold in a public offering of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 16

-Subparagraph a, b

-Article 6

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 87-21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Practice Bulletin (PB)

-Number 14

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_PartnersCapitalAccountUnitsSoldInPublicOffering
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 22

-Article 12

+ Details

Name:	us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Partnership Organization - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Mar. 15, 1998	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2008	Sep. 01, 2001
Related Party Transaction [Line Items]
Number of units sold during initial offering period	49,538
Donation of Redeemable Units to limited partners				102
Unrealized appreciation					$ 7,323,329
Percentage of partnership owned		17.30%	19.90%
Partnership liquidation date circumstance		Dec. 31, 2018
Decrease in net asset value per Redeemable Unit		400
AAA Master Fund LLC [Member]
Related Party Transaction [Line Items]
Units of partnership purchased					128,539.1485
Fair value, partnership purchased					$ 128,539,149