Account Receivable Minimum Funding Threshold Description.

No definition available.

Name:	lamr_AccountReceivableMinimumFundingThresholdDescription
Namespace Prefix:	lamr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Cash portion of gains losses on extinguishment of debt.

+ References

No definition available.

+ Details

Name:	lamr_CashPortionOfGainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	lamr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Days Sales Outstanding Due To Third Amendment To Financing Agreement.

+ References

No definition available.

+ Details

Name:	lamr_DaysSalesOutstandingDueToThirdAmendmentToFinancingAgreement
Namespace Prefix:	lamr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument Principal Amount Redemption Maximum Percentage.

+ References

No definition available.

+ Details

Name:	lamr_DebtInstrumentPrincipalAmountRedemptionMaximumPercentage
Namespace Prefix:	lamr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage premium which may be required for repayment if the Company undergoes a change in control.

+ References

No definition available.

+ Details

Name:	lamr_DebtInstrumentPurchasePriceAfterChangeOfControlPercentage
Namespace Prefix:	lamr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument Redemption Percentage Of Outstanding Post Redemption.

+ References

No definition available.

+ Details

Name:	lamr_DebtInstrumentRedemptionPercentageOfOutstandingPostRedemption
Namespace Prefix:	lamr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Repurchase Program Authorized Amount.

+ References

No definition available.

+ Details

Name:	lamr_DebtRepurchaseProgramAuthorizedAmount
Namespace Prefix:	lamr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Delinquency Ratio Due To Third Amendment To Receivables Financing Agreement.

+ References

No definition available.

+ Details

Name:	lamr_DelinquencyRatioDueToThirdAmendmentToReceivablesFinancingAgreement
Namespace Prefix:	lamr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Dilution Ratio Due To Third Amendment To Receivables Financing Agreement

+ References

No definition available.

+ Details

Name:	lamr_DilutionRatioDueToThirdAmendmentToReceivablesFinancingAgreement
Namespace Prefix:	lamr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Increase In Days Sales Outstanding Due To Third Amendment To Financing Agreement.

+ References

No definition available.

+ Details

Name:	lamr_IncreaseInDaysSalesOutstandingDueToThirdAmendmentToFinancingAgreement
Namespace Prefix:	lamr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Increase In Delinquency Ratio Due To Third Amendment To Receivables Financing Agreement

+ References

No definition available.

+ Details

Name:	lamr_IncreaseInDelinquencyRatioDueToThirdAmendmentToReceivablesFinancingAgreement
Namespace Prefix:	lamr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Increase In Dilution Ratio Due To Third Amendment To Receivables Financing Agreement.

+ References

No definition available.

+ Details

Name:	lamr_IncreaseInDilutionRatioDueToThirdAmendmentToReceivablesFinancingAgreement
Namespace Prefix:	lamr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of credit facility additional revolving commitment.

+ References

No definition available.

+ Details

Name:	lamr_LineOfCreditFacilityAdditionalRevolvingCommitment
Namespace Prefix:	lamr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of credit facility amended and restated date.

+ References

No definition available.

+ Details

Name:	lamr_LineOfCreditFacilityAmendedAndRestatedDate
Namespace Prefix:	lamr_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage Of Commitment To Maintain Minimum Borrowings

+ References

No definition available.

+ Details

Name:	lamr_PercentageOfCommitmentToMaintainMinimumBorrowings
Namespace Prefix:	lamr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Ratio of indebtedness to net capital minimum.

+ References

No definition available.

+ Details

Name:	lamr_RatioOfIndebtednessToNetCapitalMinimum
Namespace Prefix:	lamr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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

- Definition

Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of debt redemption features under terms of the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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

- Definition

End date of debt instrument redemption period, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodEndDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from bank borrowing during the year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

Name:	us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=lamr_LamarMediaCorporationAndSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lamr_DebtInstrumentRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=lamr_SeniorCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=lamr_TermALoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lamr_DebtRatioLessThanThreePointTwoFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=lamr_TermBLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lamr_DebtRatioLessThanFourPointTwoFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=lamr_DebtRatioLessThanThreePointZeroZeroMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-term Debt - Additional Information (Detail) $ in Thousands													3 Months Ended	6 Months Ended	12 Months Ended
	May 13, 2020 USD ($)	Feb. 20, 2020	Feb. 06, 2020 USD ($)	Feb. 01, 2019 USD ($)	Dec. 18, 2018 USD ($)	Mar. 19, 2018	Mar. 16, 2018 USD ($)	May 15, 2017 USD ($)	Jan. 28, 2016 USD ($)	Jan. 10, 2014 USD ($)	Oct. 30, 2012 USD ($)	Feb. 09, 2012 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 16, 2020 USD ($)	Jan. 17, 2019 USD ($)
Debt Instrument [Line Items]
Debt instrument description														On February 6, 2020, Lamar Media entered into a Fourth Amended and Restated Credit Agreement (the “Fourth Amended and Restated Credit Agreement”) with certain of Lamar Media’s subsidiaries as guarantors, JPMorgan Chase Bank, N.A. as administrative agent and the lenders party thereto, under which the parties agreed to amend and restate Lamar Media’s existing senior credit facility. The Fourth Amended and Restated Credit Agreement amended and restated the Third Amended and Restated Credit Agreement dated as of May 15, 2017, as amended (the “Third Amended and Restated Credit Agreement”).
Proceeds received from term A loans														$ 598,500		$ 599,250	$ 450,000
Redeemed percentage of aggregate principal amount			104.00%
Additional revolving commitment																			$ 100,000
Adjusted Rate			1.50%
Ratio of indebtedness to net capital one			3.25
Outstanding revolving credit facility													$ 0	0	$ 150,000
Remaining borrowing capacity under revolving credit facility													737,216	737,216	387,291
Aggregate principal amount of debt issued													3,199,014	3,199,014	3,004,532
Debt instrument outstanding amount													3,199,014	3,199,014	3,004,532	2,914,552
Debt Instrument, Interest Rate, Stated Percentage			4.00%
Loss on debt extinguishment													5	18,184		15,429	71
Redemption price percentage of the principal amount to be purchased			40.00%
4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount													$ 400,000	$ 400,000
Debt Instrument, Interest Rate, Stated Percentage													4.00%	4.00%
Redemption price percentage of the principal amount to be purchased			101.00%
4% Senior Notes [Member] \| Prior to February 15, 2023 [Member]
Debt Instrument [Line Items]
Redemption price percentage of the principal amount to be purchased			60.00%
4% Senior Notes [Member] \| Prior to February 1, 2021 [Member]
Debt Instrument [Line Items]
Redeemed percentage of aggregate principal amount			100.00%
4% Senior Notes [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount			$ 400,000
Debt Instrument, Interest Rate, Stated Percentage			4.00%
Net proceeds from the issuance of debt			$ 395,000
3 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Redemption percentage of aggregate principal amount of senior notes			40.00%
Redeemed percentage of aggregate principal amount			103.75%
Debt instrument outstanding amount													$ 600,000	$ 600,000
Debt Instrument, Interest Rate, Stated Percentage													3.75%	3.75%
Redemption price percentage of the principal amount to be purchased			60.00%
3 3/4% Senior Notes [Member] \| Prior to February 15, 2023 [Member]
Debt Instrument [Line Items]
Redemption percentage of aggregate principal amount of senior notes			100.00%
Redeemed percentage of aggregate principal amount			101.00%
3 3/4% Senior Notes [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt issued			$ 600,000
Debt Instrument, Interest Rate, Stated Percentage			3.75%
Net proceeds from the issuance of debt			$ 592,500
4 7/8% Senior Notes [Member]
Debt Instrument [Line Items]
Redemption percentage of aggregate principal amount of senior notes	40.00%
Redemption percentage of issued notes which remain outstanding	60.00%
Redeemed percentage of aggregate principal amount	104.875%
Debt instrument outstanding amount													$ 400,000	$ 400,000
Debt Instrument, Interest Rate, Stated Percentage													4.875%	4.875%
4 7/8% Senior Notes [Member] \| Prior to February 15, 2023 [Member]
Debt Instrument [Line Items]
Redeemed percentage of aggregate principal amount	100.00%
Redemption price percentage of the principal amount to be purchased	101.00%
4 7/8% Senior Notes [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt issued	$ 400,000
Net proceeds from the issuance of debt	$ 395,000
Accounts Receivable Securitization Program [Member]
Debt Instrument [Line Items]
Increase in delinquency ratio													11.00%	11.00%
Increase in dilution ratio													7.00%	7.00%
Increase in days sales outstanding														75 days
Number of days sales outstanding														65 days
Delinquency ratio													8.00%	8.00%
Dilution ratio													4.00%	4.00%
Percentage of commitment to maintain minimum borrowings														50.00%
Minimum Funding Threshold														requires the Special Purpose Subsidiaries to maintain minimum borrowings under the
Debt instrument maturity date					Dec. 17, 2021
Aggregate principal amount of debt issued					$ 175,000
Debt instrument outstanding amount													$ 0	$ 0	$ 175,000	175,000
Bearing interest rate															3.30%
5 7/8% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Redeemed percentage of aggregate principal amount						101.958%
Aggregate principal amount of debt issued												$ 500,000
Debt Instrument, Interest Rate, Stated Percentage												5.875%
Net proceeds from the issuance of debt												$ 489,000
Loss on debt extinguishment																15,429
Loss on debt extinguishment on cash																9,790
5% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt issued											$ 535,000
Debt instrument outstanding amount													$ 535,000	$ 535,000	$ 535,000	$ 535,000
Debt Instrument, Interest Rate, Stated Percentage											5.00%		5.00%	5.00%	5.00%	5.00%
Net proceeds from the issuance of debt											$ 527,100
Redemption price percentage of the principal amount to be purchased											101.00%
5 3/8% Senior Notes [Member]
Debt Instrument [Line Items]
Redemption, description		The Company used the proceeds from the 4% Senior Notes and 3 3/4% Senior Notes to redeem in full all of the 5 3/8% Notes on February 20, 2020 at a redemption price of 101% of the aggregate principal amounts of the outstanding 5 3/8% Notes, plus accrued and unpaid interest up to but not including the redemption date.
Aggregate principal amount of debt issued										$ 510,000
Debt instrument outstanding amount															$ 510,000	$ 510,000
Debt Instrument, Interest Rate, Stated Percentage									5.375%	5.375%					5.375%	5.375%
Net proceeds from the issuance of debt										$ 502,300
Loss on debt extinguishment										12,576
Loss on debt extinguishment on cash										$ 9,139
5 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt issued									$ 400,000
Debt instrument outstanding amount													$ 653,988	$ 653,988	$ 654,345	$ 400,000
Debt Instrument, Interest Rate, Stated Percentage									5.75%				5.75%	5.75%	5.75%	5.75%
Net proceeds from the issuance of debt									$ 394,500
Redemption price percentage of the principal amount to be purchased				101.00%
5 3/4% Senior Notes [Member] \| Prior to February 1, 2021 [Member]
Debt Instrument [Line Items]
Redeemed percentage of aggregate principal amount				100.00%
Redemption price percentage of the principal amount to be purchased				101.00%
5 3/4% Senior Notes [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt issued				$ 250,000
Debt Instrument, Interest Rate, Stated Percentage				5.75%
Net proceeds from the issuance of debt				$ 251,500
Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit outstanding balance													$ 12,784	$ 12,784	$ 12,709
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Proceeds received from term A loans														598,500		$ 599,250	450,000
Debt instrument outstanding amount															3,004,532	2,914,552
Loss on debt extinguishment													$ 5	$ 18,184		15,429	$ 71
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| Accounts Receivable Securitization Program [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount															175,000	175,000
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| 5% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount															$ 535,000	$ 535,000
Debt Instrument, Interest Rate, Stated Percentage															5.00%	5.00%
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| 5 3/8% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount															$ 510,000	$ 510,000
Debt Instrument, Interest Rate, Stated Percentage															5.375%	5.375%
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| 5 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount															$ 654,345	$ 400,000
Debt Instrument, Interest Rate, Stated Percentage															5.75%	5.75%
Debt Instrument Repurchase Program [Member] \| Senior or Senior Subordinated Notes and other Indebtedness [Member]
Debt Instrument [Line Items]
Debt repurchase program, authorized amount																		$ 250,000
Debt instrument repurchase expiry date														Sep. 30, 2021
Debt instrument repurchased under the program																		$ 0
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing limit of incremental loan facility			$ 750,000					$ 450,000
Debt instrument maturity date			Feb. 06, 2025					May 15, 2022
Loss on debt extinguishment														$ 5,608
Term A Loan Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing limit of incremental loan facility								$ 450,000
Debt instrument maturity date								May 15, 2022
Proceeds received from term A loans								$ 450,000
Term A Loan Facility [Member] \| LIBO Rate [Member]
Debt Instrument [Line Items]
Adjusted Rate							1.75%
Ratio of indebtedness to net capital one							3.25
Ratio of indebtedness to net capital minimum							1
Term A Loan Facility [Member] \| LIBO Rate [Member] \| Debt Ratio Less Than Three Point Two Five [Member]
Debt Instrument [Line Items]
Adjusted Rate							1.50%
Term A Loan Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Adjusted Rate							0.75%
Ratio of indebtedness to net capital one							3.25
Ratio of indebtedness to net capital minimum							1
Term A Loan Facility [Member] \| Base Rate [Member] \| Debt Ratio Less Than Three Point Two Five [Member]
Debt Instrument [Line Items]
Adjusted Rate							0.50%
Term B Loan Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing limit of incremental loan facility			$ 600,000				$ 600,000
Debt instrument maturity date			Feb. 06, 2027				Mar. 16, 2025
Proceeds received from term A loans			$ 600,000
Amended and restated date							Mar. 16, 2018
Redeemed percentage of aggregate principal amount							5.875%
Term B Loan Facility [Member] \| LIBO Rate [Member]
Debt Instrument [Line Items]
Adjusted Rate			1.50%
Term B Loan Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Adjusted Rate			0.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing limit of incremental loan facility																			$ 550,000
Revolving Credit Facility [Member] \| LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Debt instrument maturity date														Feb. 06, 2025	May 15, 2022
Revolving Credit Facility [Member] \| LIBO Rate [Member]
Debt Instrument [Line Items]
Adjusted Rate							2.25%
Ratio of indebtedness to net capital one							4.25
Ratio of indebtedness to net capital minimum			1				1
Revolving Credit Facility [Member] \| LIBO Rate [Member] \| Debt Ratio Less Than Four Point Two Five [Member]
Debt Instrument [Line Items]
Adjusted Rate							2.00%
Revolving Credit Facility [Member] \| LIBO Rate [Member] \| Debt Ratio Less Than Three Point Zero Zero [Member]
Debt Instrument [Line Items]
Adjusted Rate							1.75%
Ratio of indebtedness to net capital one							3.00
Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Adjusted Rate			1.25%				1.25%
Revolving Credit Facility [Member] \| Base Rate [Member] \| Debt Ratio Less Than Three Point Two Five [Member]
Debt Instrument [Line Items]
Adjusted Rate			0.25%
Revolving Credit Facility [Member] \| Base Rate [Member] \| Debt Ratio Less Than Four Point Two Five [Member]
Debt Instrument [Line Items]
Adjusted Rate							1.00%
Revolving Credit Facility [Member] \| Base Rate [Member] \| Debt Ratio Less Than Three Point Zero Zero [Member]
Debt Instrument [Line Items]
Adjusted Rate							0.75%
Ratio of indebtedness to net capital one							3.00
Ratio of indebtedness to net capital minimum							1