Disposal Group, Including Discontinued Operation, Sale Price

No definition available.

Name:	lpi_DisposalGroupIncludingDiscontinuedOperationSalePrice
Namespace Prefix:	lpi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Equity Method Investment Ownership Percentage Held By Investment Partner

+ References

No definition available.

+ Details

Name:	lpi_EquityMethodInvestmentOwnershipPercentageHeldByInvestmentPartner
Namespace Prefix:	lpi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting, sold during the period.

+ References

No definition available.

+ Details

Name:	lpi_EquityMethodInvestmentOwnershipPercentageSoldByInvestmentPartner
Namespace Prefix:	lpi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percent Of Ownership Interests Sold

+ References

No definition available.

+ Details

Name:	lpi_PercentOfOwnershipInterestsSold
Namespace Prefix:	lpi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate cash inflow to the entity and investment partners, associated with the sale of an LLC.

+ References

No definition available.

+ Details

Name:	lpi_TotalOwnersProceedsFromSaleOfLLC
Namespace Prefix:	lpi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Variable Interest Entity Super Majority Voting Percentage Required For Key Decisions

+ References

No definition available.

+ Details

Name:	lpi_VariableInterestEntitySuperMajorityVotingPercentageRequiredForKeyDecisions
Namespace Prefix:	lpi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Area of land held.

+ References

No definition available.

+ Details

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 percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ 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=98514028&loc=d3e3179-108585

+ Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=lpi_MedallionGatheringAndProcessingLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=lpi_GlobalInfrastructurePartnersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Divestitures - Narrative (Details) $ in Thousands			3 Months Ended			10 Months Ended
Divestitures - Narrative (Details) $ in Thousands	Feb. 01, 2018 USD ($)	Oct. 30, 2017 USD ($)	Mar. 31, 2018 USD ($)	Feb. 01, 2018 USD ($)	Mar. 31, 2017 USD ($)	Oct. 29, 2017	Jan. 31, 2017 USD ($) a property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition of equity method investee, net of selling costs			$ 1,655		$ 0
Midland Basin \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net acres sold \| a							2,900
Number of producing vertical wells sold \| property							16
Sale price							$ 59,700
Proceeds, net of working capital and post-closing adjustments							$ 59,500
Variable interest entity, not primary beneficiary \| Medallion Gathering And Processing LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage by noncontrolling owners						49.00%
Ownership percentage held by investment partner						51.00%
Variable interest entity super majority voting percentage required for key decisions						75.00%
Percent of ownership interests sold		100.00%
Equity Method Investment Ownership Percentage Sold By Investment Partner		49.00%
Proceeds from disposition of equity method investee, net of selling costs	$ 1,700	$ 829,600		$ 831,300
Global Infrastructure Partners \| Variable interest entity, not primary beneficiary \| Medallion Gathering And Processing LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration for sale		$ 1,825,000