2.4.0.84121 - Disclosure - SEGMENT INFORMATION (Details 2)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$D2013Q2http://www.sec.gov/CIK0001344980duration2013-04-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$D2012Q2http://www.sec.gov/CIK0001344980duration2012-04-01T00:00:002012-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$D2013Q2YTDhttp://www.sec.gov/CIK0001344980duration2013-01-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDfalsefalse$D2012Q2YTDhttp://www.sec.gov/CIK0001344980duration2012-01-01T00:00:002012-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 2us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Reconciliation of consolidated Segment Adjusted EBITDA Expense to operating expenses (excluding depreciation, depletion and amortization)2false 3ahgp_SegmentAdjustedEbitdaExpenseahgp_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse347874000347874[1]USD$falsetruefalse2truefalsefalse348417000348417[1]USD$falsetruefalse3truefalsefalse696777000696777[1]USD$falsetruefalse4truefalsefalse635898000635898[1]USD$falsetruefalsexbrli:monetaryItemTypemonetarySegment Adjusted EBITDA Expense includes operating expenses, outside coal purchases and other income. Transportation expenses are excluded.No definition available.false2Segment Adjusted EBITDA Expense3false 3ahgp_OutsideCoalPurchasesahgp_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-790000-790falsefalsefalse2truefalsefalse-16154000-16154falsefalsefalse3truefalsefalse-1392000-1392falsefalsefalse4truefalsefalse-30335000-30335falsefalsefalsexbrli:monetaryItemTypemonetaryCosts incurred during the reporting period for purchased coal.No definition available.false2Outside coal purchases4false 3us-gaap_OtherNonoperatingIncomeus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse353000353falsefalsefalse2truefalsefalse23840002384falsefalsefalse3truefalsefalse627000627falsefalsefalse4truefalsefalse25990002599falsefalsefalsexbrli:monetaryItemTypemonetaryThe aggregate amount of other income amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-4 -IssueDate 2006-05-01 -Chapter 4 -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. false2Other income5false 3us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortizationus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse347437000347437USD$falsetruefalse2truefalsefalse334647000334647USD$falsetruefalse3truefalsefalse696012000696012USD$falsetruefalse4truefalsefalse608162000608162USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe aggregate cost of goods produced and sold during the reporting period, excluding depreciation, depletion, and amortization.No definition available.true2Operating expenses (excluding depreciation, depletion and amortization)1Segment Adjusted EBITDA Expense includes operating expenses, outside coal purchases and other income. Transportation expenses are excluded as these expenses are passed through to the ARLP Partnership's customers and consequently it does not realize any gain or loss on transportation revenues. We review Segment Adjusted EBITDA Expense per ton for cost trends.falseSEGMENT INFORMATION (Details 2) (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.ahgp.com/role/DisclosureSegmentInformationDetails245