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Ohio River Terminal (Details) (Ohio River Terminal [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
mi
acre
May 31, 2013
Ohio River Terminal [Member]
    
Terminal purchased   $ 2.8us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= hnrg_OhioRiverTerminalMember
Secured area available 17us-gaap_AreaOfRealEstateProperty
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= hnrg_OhioRiverTerminalMember		  
Ohio River terminal mile point location 743.8hnrg_OhioRiverTerminalMilePointLocation
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= hnrg_OhioRiverTerminalMember