RECENT DEVELOPMENTS (Details) - Jun. 16, 2015 - Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] $ in Millions	USD ($) a
Interests in shallow depth coal bed methane assets
Total purchase price	$ 47
Payable in cash	$ 42
Interest in certain deep rights associated with former leases in the Atlantic Rim area
Sale of undivided interest in certain deep rights, percentage of ownership before transaction	30.00%
Percentage of the operated deep rights associated with former leases in the Atlantic Rim area after transaction	70.00%
Area of Land \| a	68,700

Area of land held.

No definition available.

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

Name:	us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percent, after disposal, of ownership interest on the operated deep rights associated with the entity's former leases owned by the entity.

+ References

No definition available.

+ Details

Name:	wres_DisposalGroupNotDiscontinuedOperationOwnershipInterestOfOperatedDeepRightsAfterDisposal
Namespace Prefix:	wres_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percent, prior to disposal, of ownership interest on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

No definition available.

+ Details

Name:	wres_DisposalGroupNotDiscontinuedOperationOwnershipInterestPriorToDisposal
Namespace Prefix:	wres_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=wres_InterestsInShallowDepthCoalBedMethaneAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=wres_InterestsInCertainDeepRightsAssociatedWithFormerLeasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: