Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$ 407,970	$ 370,089
Cash flows from investing activities:
Acquisitions	(214,559)	(48,141)
Capital expenditures	(97,680)	(82,174)
Proceeds from disposition of assets	2,658	5,760
Proceeds received from insurance claims	210	4,222
(Increase) decrease in notes receivable	(448)	7
Net cash (used in) provided by investing activities	(309,819)	(120,326)
Cash flows from financing activities:
Proceeds received from revolving credit facility	430,000	275,000
Payments on revolving credit facility	(495,000)	(368,000)
Principal payments on long-term debt	(24,446)	(20,119)
Redemption of senior subordinated notes		(509,790)
Proceeds received from senior credit facility term loans		599,250
Proceeds received from note offering	255,000
Payments on accounts receivable securitization program	(9,000)
Proceeds received from accounts receivable securitization program	9,000
Debt issuance costs	(4,454)	(6,374)
Distributions to non-controlling interest	(439)	(388)
Net cash used in financing activities	(96,502)	(353,943)
Effect of exchange rate changes in cash and cash equivalents	144	(682)
Net increase (decrease) in cash and cash equivalents	1,793	(104,862)
Cash and cash equivalents at beginning of period	21,494	115,471
Cash and cash equivalents at end of period	23,287	10,609
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	384,208	343,287
Cash flows from investing activities:
Acquisitions	(214,559)	(48,141)
Capital expenditures	(97,680)	(82,174)
Proceeds from disposition of assets	2,658	5,760
Proceeds received from insurance claims	210	4,222
(Increase) decrease in notes receivable	(448)	7
Net cash (used in) provided by investing activities	(309,819)	(120,326)
Cash flows from financing activities:
Proceeds received from revolving credit facility	430,000	275,000
Payments on revolving credit facility	(495,000)	(368,000)
Principal payments on long-term debt	(24,446)	(20,119)
Redemption of senior subordinated notes		(509,790)
Proceeds received from senior credit facility term loans		599,250
Proceeds received from note offering	255,000
Payments on accounts receivable securitization program	(9,000)
Proceeds received from accounts receivable securitization program	9,000
Debt issuance costs	(4,454)	(6,374)
Distributions to non-controlling interest	(439)	(388)
Dividends (to) from parent	(297,027)	(355,147)
Contributions from (to) parent	63,626	58,427
Net cash used in financing activities	(72,740)	(327,141)
Effect of exchange rate changes in cash and cash equivalents	144	(682)
Net increase (decrease) in cash and cash equivalents	1,793	(104,862)
Cash and cash equivalents at beginning of period	20,994	114,971
Cash and cash equivalents at end of period	22,787	10,109
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	289,262	273,307
Cash flows from investing activities:
Investment in subsidiaries	(214,559)	(60,424)
Decrease in intercompany notes receivable	7,236	32,849
(Increase) decrease in notes receivable	(448)	7
Net cash (used in) provided by investing activities	(207,771)	(27,568)
Cash flows from financing activities:
Proceeds received from revolving credit facility	430,000	275,000
Payments on revolving credit facility	(495,000)	(368,000)
Principal payments on long-term debt	(24,421)	(20,097)
Redemption of senior subordinated notes		(509,790)
Proceeds received from senior credit facility term loans		599,250
Proceeds received from note offering	255,000
Debt issuance costs	(4,454)	(6,374)
Dividends (to) from parent	(297,027)	(355,147)
Contributions from (to) parent	63,626	58,427
Net cash used in financing activities	(72,276)	(326,731)
Net increase (decrease) in cash and cash equivalents	9,215	(80,992)
Cash and cash equivalents at beginning of period	4,029	86,546
Cash and cash equivalents at end of period	13,244	5,554
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	510,514	445,984
Cash flows from investing activities:
Acquisitions	(214,559)	(48,141)
Capital expenditures	(94,820)	(78,944)
Proceeds from disposition of assets	2,658	2,952
Proceeds received from insurance claims	210
Net cash (used in) provided by investing activities	(306,511)	(124,133)
Cash flows from financing activities:
Principal payments on long-term debt	(25)	(22)
Intercompany loan (payments) proceeds	(19,641)
Dividends (to) from parent	(404,210)	(383,263)
Contributions from (to) parent	214,559	60,424
Net cash used in financing activities	(209,317)	(322,861)
Net increase (decrease) in cash and cash equivalents	(5,314)	(1,010)
Cash and cash equivalents at beginning of period	11,655	1,625
Cash and cash equivalents at end of period	6,341	615
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	(11,358)	7,259
Cash flows from investing activities:
Capital expenditures	(2,860)	(3,230)
Proceeds from disposition of assets		2,808
Proceeds received from insurance claims		4,222
Net cash (used in) provided by investing activities	(2,860)	3,800
Cash flows from financing activities:
Payments on accounts receivable securitization program	(9,000)
Proceeds received from accounts receivable securitization program	9,000
Intercompany loan (payments) proceeds	12,405	(32,849)
Distributions to non-controlling interest	(439)	(388)
Net cash used in financing activities	11,966	(33,237)
Effect of exchange rate changes in cash and cash equivalents	144	(682)
Net increase (decrease) in cash and cash equivalents	(2,108)	(22,860)
Cash and cash equivalents at beginning of period	5,310	26,800
Cash and cash equivalents at end of period	3,202	3,940
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] \| Eliminations [Member]
Cash flows from operating activities:
Net cash provided by (used in) operating activities	(404,210)	(383,263)
Cash flows from investing activities:
Investment in subsidiaries	214,559	60,424
Decrease in intercompany notes receivable	(7,236)	(32,849)
Net cash (used in) provided by investing activities	207,323	27,575
Cash flows from financing activities:
Intercompany loan (payments) proceeds	7,236	32,849
Dividends (to) from parent	404,210	383,263
Contributions from (to) parent	(214,559)	(60,424)
Net cash used in financing activities	$ 196,887	$ 355,688

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