Total price of the sale of assets, including proceeds contingent on annual incentive thresholds per agreement.

No definition available.

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Namespace Prefix:	hk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The period over which the amount of agreed contingent cash price of sale of assets is paid, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	hk_AssetSalesContingentPricePaymentPeriod
Namespace Prefix:	hk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of agreed contingent cash price of sale of assets payable per year over a certain period per agreement.

+ References

No definition available.

+ Details

Name:	hk_AssetsSaleContingentPricePerAnnum
Namespace Prefix:	hk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=hk_WaterInfrastructureAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=hk_PurchaseAndSaleAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

ACQUISITIONS AND DIVESTITURES - Water Infrastructure Assets (Details) - USD ($) $ in Thousands			12 Months Ended
	Dec. 20, 2018	Oct. 01, 2018	Dec. 31, 2018
ACQUISITIONS AND DIVESTITURES
Gain (loss) from sale of other operating property and equipment			$ 119,003
Water Infrastructure Assets \| Purchase and Sale Agreement
ACQUISITIONS AND DIVESTITURES
Sale price of asset in cash	$ 214,100
Incentives payable per year if certain thresholds are met		$ 25,000
Deferred period of sale price based on certain thresholds		5 years
(Gain) loss on sale of Water Assets \| Water Infrastructure Assets \| Purchase and Sale Agreement
ACQUISITIONS AND DIVESTITURES
Gain (loss) from sale of other operating property and equipment			$ 119,000