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SUMMARY OF SIGNIFICANT EVENTS AND ACCOUNTING POLICIES - Recently Issued Accounting Pronouncements (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Non-cancelable leases and drilling contracts |
Recently Issued Accounting Pronouncements |
Contractual obligations related to non-cancelable leases and drilling contracts | $ 15.6

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=hk_NonCancelableLeaseAndDrillingContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |