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Equity Investment in Savoy (Condensed Balance Sheet - Savoy) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Current assets | $ 84,409 us-gaap_AssetsCurrent | $ 40,170 us-gaap_AssetsCurrent
Other | 18,849 us-gaap_OtherAssetsNoncurrent | 15,382 us-gaap_OtherAssetsNoncurrent
Total assets | 579,585 us-gaap_Assets | 259,199 us-gaap_Assets
Total liabilities | 389,710 us-gaap_Liabilities | 77,079 us-gaap_Liabilities
Total liabilities and stockholders' equity | 579,585 us-gaap_LiabilitiesAndStockholdersEquity | 259,199 us-gaap_LiabilitiesAndStockholdersEquity
Savoy [Member] |  |
Current assets | 14,863 us-gaap_AssetsCurrent / dei_LegalEntityAxis = hnrg_SavoyMember | 29,182 us-gaap_AssetsCurrent / dei_LegalEntityAxis = hnrg_SavoyMember
Oil and gas properties, net | 27,549 us-gaap_OilAndGasPropertySuccessfulEffortMethodNet / dei_LegalEntityAxis = hnrg_SavoyMember | 25,408 us-gaap_OilAndGasPropertySuccessfulEffortMethodNet / dei_LegalEntityAxis = hnrg_SavoyMember
Other | 852 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = hnrg_SavoyMember | 260 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = hnrg_SavoyMember
Total assets | 43,264 us-gaap_Assets / dei_LegalEntityAxis = hnrg_SavoyMember | 54,850 us-gaap_Assets / dei_LegalEntityAxis = hnrg_SavoyMember
Total liabilities | 10,079 us-gaap_Liabilities / dei_LegalEntityAxis = hnrg_SavoyMember | 16,447 us-gaap_Liabilities / dei_LegalEntityAxis = hnrg_SavoyMember
Partners' capital | 33,185 us-gaap_PartnersCapital / dei_LegalEntityAxis = hnrg_SavoyMember | 38,403 us-gaap_PartnersCapital / dei_LegalEntityAxis = hnrg_SavoyMember
Total liabilities and stockholders' equity | $ 43,264 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = hnrg_SavoyMember | $ 54,850 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = hnrg_SavoyMember

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