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

No definition available.

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

- Definition

Amount of sale price of assets that is withheld by buyer until definite agreement is executed.

+ References

No definition available.

+ Details

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

- Definition

The amount of cash price of the sale of assets payable upon closing of the transaction.

+ References

No definition available.

+ Details

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

- Definition

Period of the operation of the assets sold whereby the entity operates the assets sold , 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_AssetSaleOperationTransitionPeriod
Namespace Prefix:	hk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The period the operation of the asset sold whereby the entity operations the assets sold in order additional capacity, 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_AssetSaleOperationTransitionPeriodToBuildCapacity
Namespace Prefix:	hk_
Data Type:	xbrli:durationItemType
Balance Type:	na
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

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=hk_SeniorRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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

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

SUBSEQUENT EVENTS - (Details) - USD ($) $ in Millions	Oct. 31, 2018	Nov. 07, 2018	Sep. 30, 2018
Senior revolving credit facility
SUBSEQUENT EVENTS
Borrowing capacity			$ 200.0
Subsequent events \| Senior revolving credit facility
SUBSEQUENT EVENTS
Borrowing capacity		$ 275.0
Purchase and Sale Agreement \| Subsequent events \| Water Infrastructure Assets
SUBSEQUENT EVENTS
Maximum sale price	$ 325.0
Cash price payable at closing	200.0
Incentives payable per year if certain thresholds are met	$ 25.0
Deferred period of sale price based on certain thresholds	5 years
Transition services period	2 months
Transition services period to install additional water service and treating infrastructure	6 months
Amount that will not be paid until definitive agreement is executive	$ 30.0