Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Total current assets	$ 784,585	$ 310,169
Net property, plant and equipment	1,343,672	1,349,115
Operating lease right of use assets	1,328,165	1,320,779
Other assets	53,316	56,574
Total assets	6,393,001	5,941,155
Current liabilities:
Current maturities of long-term debt	169,616	226,514
Current operating lease liabilities	172,179	196,841
Total current liabilities	538,932	672,808
Long-term debt, net of deferred financing costs	3,382,193	2,753,604
Operating lease liabilities	1,071,813	1,068,181
Total liabilities	5,255,217	4,760,849
Stockholders’ equity	1,137,784	1,180,306	$ 1,109,578	$ 1,131,784
Total liabilities and stockholders’ equity	6,393,001	5,941,155
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
ASSETS
Total current assets	784,085	309,669
Net property, plant and equipment	1,343,672	1,349,115
Operating lease right of use assets	1,328,165	1,320,779
Intangibles and goodwill, net	2,872,644	2,893,899
Other assets	47,700	50,959
Total assets	6,376,266	5,924,421
Current liabilities:
Current maturities of long-term debt	169,616	226,514
Current operating lease liabilities	172,179	196,841
Other current liabilities	190,962	243,494
Total current liabilities	532,757	666,849
Long-term debt, net of deferred financing costs	3,382,193	2,753,604
Operating lease liabilities	1,071,813	1,068,181
Other noncurrent liabilities	262,279	266,256
Total liabilities	5,249,042	4,754,890
Stockholders’ equity	1,127,224	1,169,531
Total liabilities and stockholders’ equity	6,376,266	5,924,421
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Lamar Media [Member]
ASSETS
Total current assets	487,176	13,859
Other assets	4,244,398	4,193,629
Total assets	4,731,574	4,207,488
Current liabilities:
Current maturities of long-term debt	(5,418)	51,480
Other current liabilities	24,927	26,960
Total current liabilities	19,509	78,440
Long-term debt, net of deferred financing costs	3,382,167	2,753,570
Other noncurrent liabilities	202,674	205,947
Total liabilities	3,604,350	3,037,957
Stockholders’ equity	1,127,224	1,169,531
Total liabilities and stockholders’ equity	4,731,574	4,207,488
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
ASSETS
Total current assets	54,532	53,756
Net property, plant and equipment	1,334,725	1,340,675
Operating lease right of use assets	1,304,978	1,293,674
Intangibles and goodwill, net	2,854,750	2,875,644
Other assets	229,672	229,905
Total assets	5,778,657	5,793,654
Current liabilities:
Current maturities of long-term debt	34	34
Current operating lease liabilities	165,770	189,071
Other current liabilities	155,846	196,689
Total current liabilities	321,650	385,794
Long-term debt, net of deferred financing costs	26	34
Operating lease liabilities	1,054,692	1,049,220
Other noncurrent liabilities	231,041	231,416
Total liabilities	1,607,409	1,666,464
Stockholders’ equity	4,171,248	4,127,190
Total liabilities and stockholders’ equity	5,778,657	5,793,654
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
ASSETS
Total current assets	242,377	242,054
Net property, plant and equipment	8,947	8,440
Operating lease right of use assets	23,187	27,105
Intangibles and goodwill, net	17,894	18,255
Other assets	185,052	184,805
Total assets	477,457	480,659
Current liabilities:
Current maturities of long-term debt	175,000	175,000
Current operating lease liabilities	6,409	7,770
Other current liabilities	10,189	19,845
Total current liabilities	191,598	202,615
Operating lease liabilities	17,121	18,961
Other noncurrent liabilities	262,154	250,859
Total liabilities	470,873	472,435
Stockholders’ equity	6,584	8,224
Total liabilities and stockholders’ equity	477,457	480,659
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Eliminations [Member]
ASSETS
Other assets	(4,611,422)	(4,557,380)
Total assets	(4,611,422)	(4,557,380)
Current liabilities:
Other noncurrent liabilities	(433,590)	(421,966)
Total liabilities	(433,590)	(421,966)
Stockholders’ equity	(4,177,832)	(4,135,414)
Total liabilities and stockholders’ equity	$ (4,611,422)	$ (4,557,380)