Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 01, 2020
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Trading Symbol	LAMR
Entity Registrant Name	LAMAR ADVERTISING CO/NEW
Entity Central Index Key	0001090425
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	1-36756
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	72-1449411
Entity Address, Address Line One	5321 Corporate Blvd.,
Entity Address, City or Town	Baton Rouge
Entity Address, State or Province	LA
Entity Address, Postal Zip Code	70808
City Area Code	225
Local Phone Number	926-1000
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Title of 12(b) Security	Class A common stock, $0.001 par value
Security Exchange Name	NASDAQ
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		86,339,239
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		14,420,085
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Registrant Name	LAMAR MEDIA CORP/DE
Entity Central Index Key	0000899045
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	1-12407
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	72-1205791
Entity Address, Address Line One	5321 Corporate Blvd.,
Entity Address, City or Town	Baton Rouge
Entity Address, State or Province	LA
Entity Address, Postal Zip Code	70808
City Area Code	225
Local Phone Number	926-1000
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Class Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		100