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

Accounts receivable securitization available borrowing amount.

+ References

No definition available.

+ Details

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

- 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

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

- Definition

Debt instrument principal redemption maximum percentage.

+ References

No definition available.

+ Details

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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

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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

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

- Definition

Debt repurchase program, authorized amount.

+ References

No definition available.

+ Details

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

- Definition

Delinquency ratio due to fourth amendment to receivables financing agreement.

+ References

No definition available.

+ Details

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

- Definition

Delinquency ratio due to third amendment to receivables financing agreement.

+ References

No definition available.

+ Details

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

- Definition

Dilution ratio due to fourth amendment to receivables financing agreement.

+ References

No definition available.

+ Details

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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

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- Definition

Increase in days sales outstanding due to third amendment to financing agreement.

+ References

No definition available.

+ Details

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- Definition

Increase in delinquency ratio due to third amendment to receivables financing agreement.

+ References

No definition available.

+ Details

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- Definition

Increase in dilution ratio due to third amendment to financing agreement.

+ References

No definition available.

+ Details

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

- Definition

Percentage of commitment to maintain minimum borrowings.

+ References

No definition available.

+ Details

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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

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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

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Data Type:	num:percentItemType
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- 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

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- 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.

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- Definition

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

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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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

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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
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Data Type:	xbrli:dateItemType
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- Definition

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

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- Definition

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

+ References

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
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- Definition

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

+ References

+ Details

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Data Type:	num:percentItemType
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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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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.

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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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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

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Data Type:	xbrli:monetaryItemType
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- 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.

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- 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

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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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The cash inflow from bank borrowing during the year.

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Balance Type:	debit
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- 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
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-Name Accounting Standards Codification
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- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

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- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
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Long-term Debt - Additional Information (Detail) - USD ($)														3 Months Ended	9 Months Ended
	Oct. 23, 2020	Sep. 16, 2020	Aug. 31, 2020	Aug. 19, 2020	Jun. 29, 2020	May 13, 2020	Feb. 20, 2020	Feb. 06, 2020	Feb. 01, 2019	Dec. 18, 2018	Jan. 28, 2016	Jan. 10, 2014	Oct. 30, 2012	Sep. 30, 2020	Sep. 30, 2020	Mar. 16, 2020	Dec. 31, 2019
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 B loans															$ 598,500,000
Loss on debt extinguishment														$ 7,051,000	25,235,000
Outstanding revolving credit facility														70,000,000	70,000,000
Remaining borrowing capacity under revolving credit facility														666,916,000	666,916,000
Aggregate principal amount of debt issued														3,005,567,000	3,005,567,000
Debt instrument outstanding amount														3,005,567,000	3,005,567,000		$ 3,004,532,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit outstanding balance														13,084,000	13,084,000
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Proceeds received from term B loans															598,500,000
Loss on debt extinguishment														$ 7,051,000	25,235,000
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Loss on debt extinguishment															$ 5,608,000
3 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								3.75%						3.75%	3.75%
Debt instrument outstanding amount														$ 600,000,000	$ 600,000,000
Redeemed percentage of aggregate principal amount								103.75%
Redemption percentage of aggregate principal amount of senior notes								40.00%
Redemption percentage of issued notes which remain outstanding								60.00%
3 3/4% 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%
3 3/4% Senior Notes [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								3.75%
Aggregate principal amount of debt issued								$ 600,000,000
Net proceeds form the issuance of debt									$ 592,500,000
4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								4.00%						4.00%	4.00%
Debt instrument outstanding amount														$ 549,260,000	$ 549,260,000
Redemption price percentage of the principal amount to be purchased								101.00%
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] \| Prior to February 15, 2023 [Member]
Debt Instrument [Line Items]
Redeemed percentage of aggregate principal amount								104.00%
Redemption percentage of aggregate principal amount of senior notes								40.00%
Redemption percentage of issued notes which remain outstanding								60.00%
4% Senior Notes [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.00%				4.00%
Aggregate principal amount of debt issued				$ 150,000,000				$ 400,000,000
Net proceeds form the issuance of debt				$ 146,900,000					$ 395,000,000
Accounts Receivable Securitization Program [Member]
Debt Instrument [Line Items]
Debt instrument maturity date										Dec. 17, 2021
Aggregate principal amount of debt issued										$ 175,000,000
Increase in delinquency ratio														11.00%	11.00%
Delinquency ratio					8.00%
Increase in dilution ratio														7.00%	7.00%
Dilution ratio					4.00%
Increase in days sales outstanding															75 days
Number of days sales outstanding					65 days
Percentage of commitment to maintain minimum borrowings	70.00%														50.00%
Minimum Funding Threshold	requires the Special Purpose Subsidiaries to maintain minimum borrowings under the Accounts Receivable Securitization Program on any day equal to the lesser of (i) 70.00% of the aggregate Commitment of all Lenders or (ii) the Borrowing Base, though the Special Purpose Subsidiaries have the right to borrow less than the Minimum Funding Threshold during certain periods prior to December 21, 2020 at their election.														requires the Special Purpose Subsidiaries to maintain minimum borrowings under the
Debt instrument outstanding amount														$ 122,500,000	$ 122,500,000		$ 175,000,000
Delinquency ratio	13.00%
Dilution ratio	5.00%
Accounts Receivable Securitization Program [Member] \| LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Available borrowing on accounts receivable securitization														$ 35,300,000	35,300,000
Accounts Receivable Securitization Program [Member] \| For Up To Two Additional Periods [Member]
Debt Instrument [Line Items]
Delinquency ratio	16.00%
5% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage													5.00%				5.00%
Loss on debt extinguishment															7,051,000
Aggregate principal amount of debt issued													$ 535,000,000
Debt instrument outstanding amount																	$ 535,000,000
Net proceeds form the issuance of debt													$ 527,100,000
Debt Instrument Redemption Amount		$ 267,500,000	$ 267,500,000
Redeemed percentage of aggregate principal amount		100.833%	100.833%
Loss on debt extinguishment on cash															4,456,000
5 3/8% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage												5.375%					5.375%
Loss on debt extinguishment															12,576,000
Aggregate principal amount of debt issued												$ 510,000,000
Debt instrument outstanding amount																	$ 510,000,000
Net proceeds form the issuance of debt												$ 502,300,000
Redeemed percentage of aggregate principal amount							101.792%
Loss on debt extinguishment on cash															$ 9,139,000
Redemption, description							Lamar Media 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 101.792% 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
5 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage											5.75%			5.75%	5.75%		5.75%
Aggregate principal amount of debt issued											$ 400,000,000
Debt instrument outstanding amount														$ 653,810,000	$ 653,810,000		$ 654,345,000
Net proceeds form the issuance of debt											$ 394,500,000
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%
5 3/4% Senior Notes [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									5.75%
Aggregate principal amount of debt issued									$ 250,000,000
Net proceeds form the issuance of debt									$ 251,500,000
4 7/8% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage														4.875%	4.875%
Debt instrument outstanding amount														$ 400,000,000	$ 400,000,000
Redeemed percentage of aggregate principal amount						104.875%
Redemption percentage of aggregate principal amount of senior notes						40.00%
Redemption percentage of issued notes which remain outstanding						60.00%
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]
Debt Instrument, Interest Rate, Stated Percentage						4.875%
Aggregate principal amount of debt issued						$ 400,000,000
Net proceeds form the issuance of debt						$ 395,000,000
Senior or Senior Subordinated Notes and other Indebtedness [Member] \| Debt Instrument Repurchase Program [Member]
Debt Instrument [Line Items]
Debt repurchase program, authorized amount																$ 250,000,000
Debt instrument repurchase expiry date															Sep. 30, 2021
Debt instrument repurchased under the program														$ 0	$ 0
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing limit of incremental loan facility								$ 750,000,000
Debt instrument maturity date								Feb. 06, 2025
Term B Loan Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing limit of incremental loan facility								$ 600,000,000
Debt instrument maturity date								Feb. 06, 2027
Proceeds received from term B loans								$ 600,000,000
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] \| LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Debt instrument maturity date															Feb. 06, 2025
Revolving Credit Facility [Member] \| LIBO Rate [Member]
Debt Instrument [Line Items]
Secured debt ratio								3.25
Adjusted Rate								1.50%
Ratio of indebtedness to net capital minimum								1
Revolving Credit Facility [Member] \| LIBO Rate [Member] \| Debt Ratio Less Than Three Point Two Five [Member]
Debt Instrument [Line Items]
Adjusted Rate								1.25%
Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Secured debt ratio								3.25
Adjusted Rate								0.50%
Ratio of indebtedness to net capital minimum								1
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] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured debt ratio								4.50