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NONCONTROLLING INTERESTS (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Noncontrolling Interest    
Net income attributable to noncontrolling interest $ 40,404us-gaap_NetIncomeLossAttributableToNoncontrollingInterest $ 47,889us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
SGP    
Noncontrolling Interest    
Net income attributable to noncontrolling interest 14us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ahgp_SpecialGeneralPartnerMember		 17us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ahgp_SpecialGeneralPartnerMember
Non-Affiliates (ARLP'S Non-Affiliate Limited Partners)    
Noncontrolling Interest    
Net income attributable to noncontrolling interest 40,403us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ahgp_NonAffiliatesMember		 47,872us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ahgp_NonAffiliatesMember
Affiliate (Cavalier Minerals)    
Noncontrolling Interest    
Net income attributable to noncontrolling interest $ (13)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ahgp_CavalierMineralsMember