Accounts receivable securitization available borrowing amount.

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Cash portion of gains losses on extinguishment of debt.

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Days sales outstanding due to third amendment to financing agreement.

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Debt instrument principal redemption maximum percentage.

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

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Debt instrument redemption percentage of outstanding post redemption.

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Debt Instrument, Redemption, Period

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Debt Instrument, Redemption Price, Principal Amount Redeemed

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Debt repurchase program, authorized amount.

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Delinquency ratio due to fourth amendment to receivables financing agreement.

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Delinquency ratio due to third amendment to receivables financing agreement.

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Dilution ratio due to fourth amendment to receivables financing agreement.

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Dilution ratio due to third amendment to receivables financing agreement.

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

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

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Percentage of commitment to maintain minimum borrowings.

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Ratio of indebtedness to net capital minimum.

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

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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.

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

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

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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.

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

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Percentage of principal amount of debt redeemed.

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Fair value amount of debt instrument that was repurchased.

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

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

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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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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.

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

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The cash inflow from bank borrowing during the year.

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

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Indebtedness divided by net capital.

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Long-term Debt - Additional Information (Detail) - USD ($)											3 Months Ended		9 Months Ended
	May 24, 2021	Feb. 03, 2021	Jan. 22, 2021	Oct. 23, 2020	Aug. 19, 2020	Jun. 30, 2020	May 13, 2020	Feb. 06, 2020	Feb. 01, 2019	Jan. 28, 2016	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Mar. 16, 2020	Dec. 18, 2018
Debt Instrument [Line Items]
Proceeds received from term B loans													$ 0	$ 598,500,000
Loss on extinguishment of debt											$ 0	$ 7,051,000	21,604,000	25,235,000
Aggregate principal amount of debt issued											2,875,468,000		2,875,468,000
Debt instrument outstanding amount											$ 2,875,468,000		$ 2,875,468,000		$ 2,926,633,000
4% Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					4.00%			4.00%			4.00%		4.00%		4.00%
Debt instrument outstanding amount											$ 549,339,000		$ 549,339,000		$ 549,280,000
Redemption period								120 days
Redemption price percentage of the principal amount to be purchased								101.00%
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Aggregate principal amount of debt issued																	$ 175,000,000
Increase in delinquency ratio						11.00%
Delinquency ratio						8.00%
Increase in dilution ratio						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	50.00%			70.00%		50.00%
Delinquency ratio				13.00%
Dilution ratio				5.00%
Debt instrument outstanding amount											$ 175,000,000		175,000,000		$ 122,500,000
5 3/4% Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage										5.75%					5.75%
Loss on extinguishment of debt													21,604,000
Aggregate principal amount of debt issued										$ 400,000,000
Debt instrument outstanding amount															$ 653,631,000
Net proceeds form the issuance of debt										$ 394,500,000
Principal amount redeemed		$ 650,000,000
Percentage of principal amount redeemed		102.875%
Loss on debt extinguishment on cash													$ 18,700,000
3 3/4% Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								3.75%			3.75%		3.75%		3.75%
Debt instrument outstanding amount											$ 600,000,000		$ 600,000,000		$ 600,000,000
Redemption percentage of aggregate principal amount of senior notes								40.00%
Redeemed percentage of aggregate principal amount								103.75%
Redemption percentage of issued notes which remain outstanding								60.00%
4 7/8% Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage											4.875%		4.875%		4.875%
Debt instrument outstanding amount											$ 400,000,000		$ 400,000,000		$ 400,000,000
Redemption percentage of aggregate principal amount of senior notes							40.00%
Redeemed percentage of aggregate principal amount							104.875%
Redemption percentage of issued notes which remain outstanding							60.00%
3 5/8% Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage											3.625%		3.625%
Debt instrument outstanding amount											$ 550,000,000		$ 550,000,000
Redemption percentage of aggregate principal amount of senior notes			40.00%
Redeemed percentage of aggregate principal amount			103.625%
Redemption percentage of issued notes which remain outstanding			60.00%
Redemption period			120 days
Redemption price percentage of the principal amount to be purchased			101.00%
Redemption Period One \| 4% Senior Notes
Debt Instrument [Line Items]
Redemption percentage of aggregate principal amount of senior notes								40.00%
Redeemed percentage of aggregate principal amount								104.00%
Redemption percentage of issued notes which remain outstanding								60.00%
Redemption Period One \| 3 3/4% Senior Notes
Debt Instrument [Line Items]
Redeemed percentage of aggregate principal amount								100.00%
Redemption price percentage of the principal amount to be purchased								101.00%
Redemption Period One \| 4 7/8% Senior Notes
Debt Instrument [Line Items]
Redeemed percentage of aggregate principal amount							100.00%
Redemption price percentage of the principal amount to be purchased							101.00%
Redemption Period One \| 3 5/8% Senior Notes
Debt Instrument [Line Items]
Redeemed percentage of aggregate principal amount			100.00%
Redemption Period Two \| 4% Senior Notes
Debt Instrument [Line Items]
Redeemed percentage of aggregate principal amount								100.00%
Private Placement \| 4% Senior Notes
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
Private Placement \| 5 3/4% Senior Notes
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
Private Placement \| 3 3/4% Senior Notes
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
Redemption period								120 days
Private Placement \| 4 7/8% Senior Notes
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
Redemption period							120 days
Private Placement \| 3 5/8% Senior Notes
Debt Instrument [Line Items]
Proceeds received from term B loans			$ 542,500,000
Debt Instrument, Interest Rate, Stated Percentage			3.625%
Aggregate principal amount of debt issued			$ 550,000,000
Letter of Credit
Debt Instrument [Line Items]
Letter of credit outstanding balance											14,345,000		14,345,000
For Up To Two Additional Periods \| Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Delinquency ratio				16.00%
Debt Instrument Repurchase Program \| Senior or Senior Subordinated Notes and other Indebtedness
Debt Instrument [Line Items]
Debt repurchase program, authorized amount																$ 250,000,000
Debt instrument repurchased under the program											0		0
LAMAR MEDIA CORP. AND SUBSIDIARIES
Debt Instrument [Line Items]
Proceeds received from term B loans													0	598,500,000
Loss on extinguishment of debt											0	$ 7,051,000	21,604,000	25,235,000
LAMAR MEDIA CORP. AND SUBSIDIARIES \| Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Available borrowing on accounts receivable securitization											0		0
Senior Credit Facility
Debt Instrument [Line Items]
Loss on extinguishment of debt														$ 5,608,000
Senior Credit Facility
Debt Instrument [Line Items]
Maximum borrowing limit of incremental loan facility								$ 750,000,000
Term B Loan Facility
Debt Instrument [Line Items]
Maximum borrowing limit of incremental loan facility								600,000,000
Proceeds received from term B loans								$ 600,000,000
Term B Loan Facility \| LIBO Rate
Debt Instrument [Line Items]
Adjusted base rate								1.50%
Term B Loan Facility \| Base Rate
Debt Instrument [Line Items]
Adjusted base rate								0.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding revolving credit facility											0		0
Remaining borrowing capacity under revolving credit facility											$ 735,655,000		$ 735,655,000
Revolving Credit Facility \| Secured Debt
Debt Instrument [Line Items]
Secured debt ratio								4.50
Revolving Credit Facility \| LIBO Rate
Debt Instrument [Line Items]
Secured debt ratio								3.25
Adjusted base rate								1.50%
Ratio of indebtedness to net capital minimum								1
Revolving Credit Facility \| LIBO Rate \| Debt Ratio Less Than Three Point Two Five
Debt Instrument [Line Items]
Adjusted base rate								1.25%
Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Secured debt ratio								3.25
Adjusted base rate								0.50%
Ratio of indebtedness to net capital minimum								1
Revolving Credit Facility \| Base Rate \| Debt Ratio Less Than Three Point Two Five
Debt Instrument [Line Items]
Adjusted base rate								0.25%