Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$ 569,873	$ 630,865	$ 564,846
Cash flows from investing activities:
Capital expenditures	(62,272)	(140,956)	(117,638)
Acquisitions	(45,584)	(226,278)	(477,389)
Proceeds from disposition of assets and investments	10,968	5,438	6,648
Proceeds received from property insurance claims		210	4,222
(Increase) decrease in notes receivable		(448)	9
Cash flows used in investing activities	(96,888)	(362,034)	(584,148)
Cash flows from financing activities:
Payment on revolving credit facility	(875,000)	(625,000)	(481,000)
Principal payments on long term debt	(9,112)	(34,471)	(27,328)
Borrowings on long term debt	8,750
Proceeds received from note offering	1,549,250	255,000
Redemption of senior notes and senior subordinated notes	(1,058,596)		(509,790)
Proceeds received from senior credit facility term loans	598,500		599,250
Payments on senior credit facility term loans	(978,097)
Payment on accounts receivable securitization program	(175,000)	(9,000)
Proceeds received from accounts receivable securitization program	122,500	9,000	175,000
Debt issuance costs	(32,950)	(4,463)	(7,616)
Distributions to non-controlling interest	(1,509)	(621)	(541)
Cash flows used in financing activities	(377,917)	(264,357)	(73,563)
Effect of exchange rate changes in cash and cash equivalents	313	220	(1,112)
Net increase (decrease) in cash and cash equivalents	95,381	4,694	(93,977)
Cash and cash equivalents at beginning of period	26,188	21,494	115,471
Cash and cash equivalents at end of period	121,569	26,188	21,494
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	539,029	604,940	537,085
Cash flows from investing activities:
Capital expenditures	(62,272)	(140,956)	(117,638)
Acquisitions	(45,584)	(226,278)	(477,389)
Proceeds from disposition of assets and investments	10,968	5,438	6,648
Proceeds received from property insurance claims		210	4,222
(Increase) decrease in notes receivable		(448)	9
Cash flows used in investing activities	(96,888)	(362,034)	(584,148)
Cash flows from financing activities:
Proceeds received from revolving credit facility	725,000	495,000	563,000
Payment on revolving credit facility	(875,000)	(625,000)	(481,000)
Principal payments on long term debt	(9,112)	(34,471)	(27,328)
Borrowings on long term debt	8,750
Proceeds received from note offering	1,549,250	255,000
Redemption of senior notes and senior subordinated notes	(1,058,596)		(509,790)
Proceeds received from senior credit facility term loans	598,500		599,250
Payments on senior credit facility term loans	(978,097)
Payment on accounts receivable securitization program	(175,000)	(9,000)
Proceeds received from accounts receivable securitization program	122,500	9,000	175,000
Debt issuance costs	(32,950)	(4,463)	(7,616)
Distributions to non-controlling interest	(1,509)	(621)	(541)
Dividends (to) from parent	(262,437)	(393,700)	(446,744)
Contributions from (to) parent	41,628	69,822	89,967
Cash flows used in financing activities	(347,073)	(238,433)	(45,802)
Effect of exchange rate changes in cash and cash equivalents	313	221	(1,112)
Net increase (decrease) in cash and cash equivalents	95,381	4,694	(93,977)
Cash and cash equivalents at beginning of period	25,688	20,994	114,971
Cash and cash equivalents at end of period	121,069	25,688	20,994
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| Reportable Legal Entities [Member] \| Lamar Media [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	495,872	469,907	430,896
Cash flows from investing activities:
Acquisitions	577
Investment in subsidiaries	(46,161)	(226,278)	(498,226)
Increease in intercompany notes receivable	(60,183)	3,787	30,034
(Increase) decrease in notes receivable		(448)	9
Cash flows used in investing activities	(105,767)	(222,939)	(468,183)
Cash flows from financing activities:
Proceeds received from revolving credit facility	725,000	495,000	563,000
Payment on revolving credit facility	(875,000)	(625,000)	(481,000)
Principal payments on long term debt		(34,471)	(27,297)
Proceeds received from note offering	1,549,250	255,000
Redemption of senior notes and senior subordinated notes	(1,058,596)		(509,790)
Proceeds received from senior credit facility term loans	598,500		599,250
Payments on senior credit facility term loans	(978,097)
Debt issuance costs	(32,950)	(4,463)	(7,616)
Intercompany loan proceeds (payments)			175,000
Dividends (to) from parent	(262,437)	(393,700)	(446,744)
Contributions from (to) parent	41,628	69,822	89,967
Cash flows used in financing activities	(292,702)	(237,812)	(45,230)
Net increase (decrease) in cash and cash equivalents	97,403	9,156	(82,517)
Cash and cash equivalents at beginning of period	13,185	4,029	86,546
Cash and cash equivalents at end of period	110,588	13,185	4,029
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| Reportable Legal Entities [Member] \| Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	668,673	738,030	689,718
Cash flows from investing activities:
Capital expenditures	(56,772)	(136,696)	(113,259)
Acquisitions	(46,161)	(226,278)	(477,389)
Proceeds from disposition of assets and investments	10,968	5,438	3,839
Proceeds received from property insurance claims		210
Cash flows used in investing activities	(91,965)	(357,326)	(586,809)
Cash flows from financing activities:
Principal payments on long term debt	(9,112)		(31)
Borrowings on long term debt	8,750
Intercompany loan proceeds (payments)	(9,176)	(702)	(24,688)
Dividends (to) from parent	(619,877)	(609,657)	(566,386)
Contributions from (to) parent	46,161	226,278	498,226
Cash flows used in financing activities	(583,254)	(384,081)	(92,879)
Net increase (decrease) in cash and cash equivalents	(6,546)	(3,377)	10,030
Cash and cash equivalents at beginning of period	8,278	11,655	1,625
Cash and cash equivalents at end of period	1,732	8,278	11,655
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| Reportable Legal Entities [Member] \| Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	(5,639)	6,660	(17,143)
Cash flows from investing activities:
Capital expenditures	(5,500)	(4,260)	(4,379)
Proceeds from disposition of assets and investments			2,809
Proceeds received from property insurance claims			4,222
Cash flows used in investing activities	(5,500)	(4,260)	2,652
Cash flows from financing activities:
Payment on accounts receivable securitization program	(175,000)	(9,000)
Proceeds received from accounts receivable securitization program	122,500	9,000	175,000
Intercompany loan proceeds (payments)	69,359	(3,085)	(180,346)
Distributions to non-controlling interest	(1,509)	(621)	(541)
Cash flows used in financing activities	15,350	(3,706)	(5,887)
Effect of exchange rate changes in cash and cash equivalents	313	221	(1,112)
Net increase (decrease) in cash and cash equivalents	4,524	(1,085)	(21,490)
Cash and cash equivalents at beginning of period	4,225	5,310	26,800
Cash and cash equivalents at end of period	8,749	4,225	5,310
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| Eliminations [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	(619,877)	(609,657)	(566,386)
Cash flows from investing activities:
Investment in subsidiaries	46,161	226,278	498,226
Increease in intercompany notes receivable	60,183	(3,787)	(30,034)
Cash flows used in investing activities	106,344	222,491	468,192
Cash flows from financing activities:
Intercompany loan proceeds (payments)	(60,183)	3,787	30,034
Dividends (to) from parent	619,877	609,657	566,386
Contributions from (to) parent	(46,161)	(226,278)	(498,226)
Cash flows used in financing activities	$ 513,533	$ 387,166	$ 98,194

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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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