Cash portion of gains losses on extinguishment of debt.

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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 repurchase program, authorized amount.

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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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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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Description of a fee associated with the debt instrument, including a commitment fee on unborrowed portions of a lender's total contractual commitment.

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

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

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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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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 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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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.

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Indebtedness divided by net capital.

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Long-term Debt - Additional Information (Detail) - USD ($)								3 Months Ended
	Feb. 20, 2020	Feb. 06, 2020	Feb. 01, 2019	Dec. 18, 2018	Jan. 28, 2016	Jan. 10, 2014	Oct. 30, 2012	Mar. 31, 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								18,179,000
Outstanding revolving credit facility								625,000,000
Remaining borrowing capacity under revolving credit facility								111,916,000
Aggregate principal amount of debt issued								3,590,472,000
Debt instrument outstanding amount								3,590,472,000		$ 3,004,532,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit outstanding balance								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								18,179,000
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Loss on debt extinguishment								$ 5,603,000
3 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.75%						3.75%
Debt instrument outstanding amount								$ 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]
Redemption price percentage of the principal amount to be purchased		101.00%
Redeemed percentage of aggregate principal amount		100.00%
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%
Debt instrument outstanding amount								$ 400,000,000
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%
Aggregate principal amount of debt issued		$ 400,000,000
Net proceeds form the issuance of debt			$ 395,000,000
AR Program [Member]
Debt Instrument [Line Items]
Debt instrument maturity date				Dec. 17, 2021
Aggregate principal amount of debt issued				$ 175,000,000
Accounts Receivable Securitization Program [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount								$ 175,000,000		$ 175,000,000
Bearing interest rate								1.80%
Debt instrument commitment fee								no
5% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							5.00%	5.00%		5.00%
Aggregate principal amount of debt issued							$ 535,000,000
Debt instrument outstanding amount								$ 535,000,000		$ 535,000,000
Net proceeds form the issuance of debt							$ 527,100,000
Redemption price percentage of the principal amount to be purchased							101.00%
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
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
Redeemed percentage of aggregate principal amount	101.00%
Loss on debt extinguishment on cash								$ 9,139,000
5 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					5.75%			5.75%		5.75%
Aggregate principal amount of debt issued					$ 400,000,000
Debt instrument outstanding amount								$ 654,167,000		$ 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
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
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