2.4.0.84040 - Disclosure - ACQUISITIONS (Details)truefalseIn Millions, unless otherwise specifiedfalse1false USDfalsefalse$D2013Q2_M06_AllianceResourcePropertiesLLCMember_CoalReserveAcquisitionLaurelRunMiningMemberhttp://www.sec.gov/CIK0001344980duration2013-06-01T00:00:002013-06-30T00:00:00TonStandardhttp://www.xbrl.org/2009/utrTutr0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse1false USDtruefalse$D2013Q2_M06_AllianceResourcePropertiesLLCMember_CoalReserveAcquisitionLaurelRunMiningMemberhttp://www.sec.gov/CIK0001344980duration2013-06-01T00:00:002013-06-30T00:00:00falsefalseAlliance Resource Propertiesdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldiahgp_AllianceResourcePropertiesLLCMemberdei_LegalEntityAxisexplicitMemberfalsefalseAcquisition of coal reserves from Laurel Run Mining Companyus-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxisxbrldihttp://xbrl.org/2006/xbrldiahgp_CoalReserveAcquisitionLaurelRunMiningMemberus-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxisexplicitMemberTonStandardhttp://www.xbrl.org/2009/utrTutr0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Alliance Resource Properties | Acquisition of coal reserves from Laurel Run Mining Company2true 3us-gaap_SignificantAcquisitionsAndDisposalsLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Asset Acquisition3false 4ahgp_CoalReservesRightsPurchasedApproximateTonnageahgp_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse1160000011600000falsefalsefalsenum:massItemTypedecimalRepresents the approximate amount of proven and probable coal reserves for which the rights were purchased in the transaction.No definition available.false256Proven and probable coal reserves (in tons)4false 4ahgp_CoalResourceRightsPurchasedApproximateTonnageahgp_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse59000005900000falsefalsefalsenum:massItemTypedecimalRepresents the approximate amount of coal resources not classified as reserves for which rights were purchased in the transaction.No definition available.false256Additional coal resources (in tons)5false 4us-gaap_PaymentsToAcquireMineralRightsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1truefalsefalse2520000025.2USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe cash outflow from the acquisition of a mineral right which is the right to extract a mineral from the earth or to receive payment, in the form of royalty, for the extraction of minerals.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -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. false2Purchase pricefalseACQUISITIONS (Details) (Alliance Resource Properties, Acquisition of coal reserves from Laurel Run Mining Company, USD $)HundredThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.ahgp.com/role/DisclosureAcquisitionsDetails15