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Long-term Debt - Additional Information (Detail) |  |  |  |  |  |  |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 ($) | Feb. 09, 2012 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jan. 17, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds received from term A loans |  |  |  |  |  |  |  |  |  |  | $ 599,250,000 |  |
Additional revolving commitment |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |
Outstanding revolving credit facility |  |  |  |  |  |  |  |  |  | $ 215,000,000 |  |  |
Remaining borrowing capacity under revolving credit facility |  |  |  |  |  |  |  |  |  | 322,148,000 |  |  |
Aggregate principal amount of debt issued |  |  |  |  |  |  |  |  |  | 3,079,710,000 |  |  |
Debt instrument outstanding amount |  |  |  |  |  |  |  |  |  | 3,079,710,000 |  |  | $ 2,914,552,000
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  |  | 15,429,000 |  |
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 |  |  |  |  |  |  |  |  |  | 3.80% |  |  |
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 |  |  |  |
Interest rate on convertible notes |  |  |  |  |  |  |  |  | 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 3/4% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt issued |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
Debt instrument outstanding amount |  |  |  |  |  |  |  |  |  | $ 654,524,000 |  |  | $ 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, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of loan | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
5 3/4% Senior Notes [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt issued | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on convertible notes | 5.75% |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the issuance of debt | $ 251,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit outstanding balance |  |  |  |  |  |  |  |  |  | $ 12,852,000 |  |  |
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds received from term A loans |  |  |  |  |  |  |  |  |  |  | 599,250,000 |  |
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  |  | $ 15,429,000 |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing limit of incremental loan facility |  |  |  |  |  |  |  |  |  |  |  | $ 550,000,000 |
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 |  |  |  |  |  |  |  |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&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=119400593&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=6877327&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=6876686&loc=d3e534808-122878 + Details
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- 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=6877327&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
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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. + 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=6877327&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=6876686&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=119400593&loc=d3e572229-122910 + Details
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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 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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