2.4.0.84090 - Disclosure - WORKERS' COMPENSATION AND PNEUMOCONIOSIS (Details)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$1true 2ahgp_WorkersCompensationLiabilityRollForwardahgp_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Reconciliation of the changes in workers' compensation liability2false 3us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrentus-gaap_truecreditinstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse7875500078755USD$falsetruefalse2truefalsefalse7690200076902USD$falsetruefalse3truefalsefalse7704600077046USD$falsetruefalse4truefalsefalse7320100073201USD$falsetruefalsexbrli:monetaryItemTypemonetaryCarrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 false2Beginning balance3false 3ahgp_WorkersCompensationLiabilityAccrualsNetahgp_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse39820003982falsefalsefalse2truefalsefalse62910006291falsefalsefalse3truefalsefalse79470007947falsefalsefalse4truefalsefalse1221400012214falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the change in the liability for workers' compensation due to additional amounts accrued during the period, net of valuation gain or loss.No definition available.false2Accruals increase4false 3ahgp_PaymentsOfWorkersCompensationahgp_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-2727000-2727falsefalsefalse2truefalsefalse-2683000-2683falsefalsefalse3truefalsefalse-5603000-5603falsefalsefalse4truefalsefalse-5589000-5589falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the change in the liability for workers' compensation due to payments made during the period.No definition available.false2Payments5false 3us-gaap_AccretionExpenseus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse620000620falsefalsefalse2truefalsefalse685000685falsefalsefalse3truefalsefalse12400001240falsefalsefalse4truefalsefalse13690001369falsefalsefalsexbrli:monetaryItemTypemonetaryAmount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. 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