Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$ 62,932	$ 60,726
Cash flows from investing activities:
Acquisitions	(13,565)	(66,423)
Capital expenditures	(25,709)	(25,951)
Proceeds from disposition of assets and investments	3,686	1,297
Decrease in notes receivable		2
Net cash (used in) provided by investing activities	(35,588)	(91,075)
Cash flows from financing activities:
Principal payments on long term debt	(89)	(7,210)
Payments on revolving credit facility	(180,000)	(255,000)
Proceeds received from revolving credit facility	655,000	155,000
Proceeds received from note offering	1,000,000	255,000
Payments on accounts receivable securitization program		(7,000)
Proceeds received from senior credit facility term loans	598,500
Payments on senior credit facility term loans	(978,097)
Redemption of senior subordinated notes	(519,139)
Debt issuance costs	(24,042)	(4,256)
Distributions to non-controlling interest	(860)	(137)
Net cash (used in) provided by financing activities	443,639	41,583
Effect of exchange rate changes in cash and cash equivalents	(532)	100
Net increase in cash and cash equivalents	470,451	11,334
Cash and cash equivalents at beginning of period	26,188	21,494
Cash and cash equivalents at end of period	496,639	32,828
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	36,624	39,539
Cash flows from investing activities:
Acquisitions	(13,565)	(66,423)
Capital expenditures	(25,709)	(25,951)
Proceeds from disposition of assets and investments	3,686	1,297
Decrease in notes receivable		2
Net cash (used in) provided by investing activities	(35,588)	(91,075)
Cash flows from financing activities:
Principal payments on long term debt	(89)	(7,210)
Payments on revolving credit facility	(180,000)	(255,000)
Proceeds received from revolving credit facility	655,000	155,000
Proceeds received from note offering	1,000,000	255,000
Payments on accounts receivable securitization program		(7,000)
Redemption of senior subordinated notes	(519,139)
Proceeds received from senior credit facility term loans	598,500
Payments on senior credit facility term loans	(978,097)
Debt issuance costs	(24,042)	(4,256)
Distributions to non-controlling interest	(860)	(137)
Dividends (to) from parent	(110,755)	(104,597)
Contributions from (to) parent	29,429	30,970
Net cash (used in) provided by financing activities	469,947	62,770
Effect of exchange rate changes in cash and cash equivalents	(532)	100
Net increase in cash and cash equivalents	470,451	11,334
Cash and cash equivalents at beginning of period	25,688	20,994
Cash and cash equivalents at end of period	496,139	32,328
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	24,222	20,980
Cash flows from investing activities:
Investment in subsidiaries	(13,565)	(66,423)
(Increase) decrease in intercompany notes receivable	(8,155)	(10,470)
Decrease in notes receivable		2
Net cash (used in) provided by investing activities	(21,720)	(76,891)
Cash flows from financing activities:
Principal payments on long term debt	(81)	(7,210)
Payments on revolving credit facility	(180,000)	(255,000)
Proceeds received from revolving credit facility	655,000	155,000
Proceeds received from note offering	1,000,000	255,000
Redemption of senior subordinated notes	(519,139)
Proceeds received from senior credit facility term loans	598,500
Payments on senior credit facility term loans	(978,097)
Debt issuance costs	(24,042)	(4,256)
Dividends (to) from parent	(110,755)	(104,597)
Contributions from (to) parent	29,429	30,970
Net cash (used in) provided by financing activities	470,815	62,907
Intercompany loan (payments) proceeds		(7,000)
Net increase in cash and cash equivalents	473,317	6,996
Cash and cash equivalents at beginning of period	13,185	4,029
Cash and cash equivalents at end of period	486,502	11,025
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	82,135	53,074
Cash flows from investing activities:
Acquisitions	(13,565)	(66,423)
Capital expenditures	(24,531)	(25,413)
Proceeds from disposition of assets and investments	3,686	1,297
Net cash (used in) provided by investing activities	(34,410)	(90,539)
Cash flows from financing activities:
Principal payments on long term debt	(8)
Intercompany loan (payments) proceeds	(3,436)
Dividends (to) from parent	(63,763)	(50,594)
Contributions from (to) parent	13,565	66,423
Net cash (used in) provided by financing activities	(53,642)	40,015
Intercompany loan (payments) proceeds		24,186
Net increase in cash and cash equivalents	(5,917)	2,550
Cash and cash equivalents at beginning of period	8,278	11,655
Cash and cash equivalents at end of period	2,361	14,205
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	(5,970)	16,079
Cash flows from investing activities:
Capital expenditures	(1,178)	(538)
Net cash (used in) provided by investing activities	(1,178)	(538)
Cash flows from financing activities:
Payments on accounts receivable securitization program		(7,000)
Intercompany loan (payments) proceeds	11,591
Distributions to non-controlling interest	(860)	(137)
Net cash (used in) provided by financing activities	10,731	(13,853)
Intercompany loan (payments) proceeds		(6,716)
Effect of exchange rate changes in cash and cash equivalents	(532)	100
Net increase in cash and cash equivalents	3,051	1,788
Cash and cash equivalents at beginning of period	4,225	5,310
Cash and cash equivalents at end of period	7,276	7,098
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| Eliminations [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	(63,763)	(50,594)
Cash flows from investing activities:
Investment in subsidiaries	13,565	66,423
(Increase) decrease in intercompany notes receivable	8,155	10,470
Net cash (used in) provided by investing activities	21,720	76,893
Cash flows from financing activities:
Intercompany loan (payments) proceeds	(8,155)
Dividends (to) from parent	63,763	50,594
Contributions from (to) parent	(13,565)	(66,423)
Net cash (used in) provided by financing activities	$ 42,043	(26,299)
Intercompany loan (payments) proceeds		$ (10,470)

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