Cash portion of gains losses on extinguishment of debt.

No definition available.

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- Definition

Percentage of aggregate principle which may be redeemed at any time at a specified price.

+ References

No definition available.

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- Definition

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

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No definition available.

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- Definition

Debt instrument redemption, percentage of debt outstanding, post redemption.

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No definition available.

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- Definition

Line of credit facility amended and restated date.

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No definition available.

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- Definition

Ratio of indebtedness to net capital minimum.

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No definition available.

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- Definition

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

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No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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

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- Definition

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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No definition available.

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

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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No definition available.

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- 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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- Definition

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

+ References

No definition available.

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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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- 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.

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- 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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- 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

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- Definition

The cash inflow from bank borrowing during the year.

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- Definition

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

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-Name Accounting Standards Codification
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-Paragraph 14
-Subparagraph (b)
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Period Type:	duration

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

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Long-term Debt - Additional Information (Detail)									12 Months Ended
Long-term Debt - Additional Information (Detail)	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 ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Proceeds received from term A loans									$ 599,250,000	$ 450,000,000	$ 300,000,000
Outstanding revolving credit facility									280,000,000
Remaining borrowing capacity under revolving credit facility									156,817,000
Aggregate principal amount of debt issued									2,914,552,000
Debt instrument outstanding amount									2,914,552,000	2,585,409,000
Loss on debt extinguishment									15,429,000	71,000	3,198,000
AR Program [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	Dec. 17, 2021
Aggregate principal amount of debt issued	$ 175,000,000
Debt instrument outstanding amount									$ 175,000,000
Bearing interest rate									3.40%
5 7/8% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Redemption price, percentage of loan		101.958%
Aggregate principal amount of debt issued								$ 500,000,000
Debt instrument outstanding amount										$ 500,000,000
Interest rate on convertible notes								5.875%		5.875%
Net proceeds from the issuance of debt								$ 489,000,000
Loss on debt extinguishment									$ 15,429,000
Loss on debt extinguishment on cash									9,790,000
5% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt issued							$ 535,000,000
Debt instrument outstanding amount									$ 535,000,000	$ 535,000,000
Interest rate on convertible notes							5.00%		5.00%	5.00%
Net proceeds from 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]
Aggregate principal amount of debt issued						$ 510,000,000
Debt instrument outstanding amount									$ 510,000,000	$ 510,000,000
Interest rate on convertible notes						5.375%			5.375%	5.375%
Net proceeds from the issuance of debt						$ 502,300,000
Redemption price percentage of the principal amount to be purchased						101.00%
5 3/8% Senior Notes [Member] \| Prior to January 15, 2019 [Member]
Debt Instrument [Line Items]
Redemption percentage equal to principal amount include aggregate premium						100.00%
5 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt issued					$ 400,000,000
Debt instrument outstanding amount									$ 400,000,000	$ 400,000,000
Interest rate on convertible notes					5.75%				5.75%	5.75%
Net proceeds from 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, 2019 [Member]
Debt Instrument [Line Items]
Redemption price, percentage of loan					105.75%
Redemption percentage of aggregate principal amount of senior notes					35.00%
Redemption percentage of issued notes which remain outstanding					65.00%
5 3/4% Senior Notes [Member] \| Prior to February 1, 2021 [Member]
Debt Instrument [Line Items]
Redemption price, percentage of loan					100.00%
Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit outstanding balance									$ 13,183,000
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Proceeds received from term A loans									599,250,000	$ 450,000,000	300,000,000
Debt instrument outstanding amount									2,914,552,000	2,585,409,000
Loss on debt extinguishment									15,429,000	71,000	$ 3,198,000
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| AR Program [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount									175,000,000
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| 5 7/8% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount										$ 500,000,000
Interest rate on convertible notes										5.875%
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| 5% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount									$ 535,000,000	$ 535,000,000
Interest rate on convertible notes									5.00%	5.00%
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| 5 3/8% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount									$ 510,000,000	$ 510,000,000
Interest rate on convertible notes									5.375%	5.375%
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| 5 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument outstanding amount									$ 400,000,000	$ 400,000,000
Interest rate on convertible notes									5.75%	5.75%
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing limit of incremental loan facility				$ 450,000,000
Debt instrument maturity date				May 15, 2022
Term A Loan Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing limit of incremental loan facility				$ 450,000,000
Debt instrument maturity date				May 15, 2022
Proceeds received from term A loans				$ 450,000,000
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			$ 600,000,000
Debt instrument maturity date			Mar. 16, 2025
Amended and restated date			Mar. 16, 2018
Redemption price, percentage of loan			5.875%
Revolving Credit Facility [Member] \| LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Debt instrument maturity date									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
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
Ratio of indebtedness to net capital minimum			1
Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Adjusted Rate			1.25%
Ratio of indebtedness to net capital one			4.25
Ratio of indebtedness to net capital minimum			1
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