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REVENUE - Schedule of beginning and ending contract liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
REVENUE |  |
Total contract liabilities - beginning balance | $ 146,719 | $ 113,741
Cash payments received on future contract obligations | 37,296 | 35,355
Accretion on contract liabilities | 1,560 |
Revenue recognized, cash payment received in prior period | (35,668) | (24,529)
Total contract liabilities - ending balance | $ 149,907 | $ 124,567

X
- Definition Amount of increase through recognition of expense for the passage of time, typically for liabilities, that have been discounted to their net present values attributable to contract with customer liabilities for the reporting period. + References No definition available. + Details
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- Definition Amount of increase in contract with customer liability due to cash received from customers as progress payments for future contractual obligations, during the reporting period. + References No definition available. + Details
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Namespace Prefix: | hnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
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Period Type: | instant

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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