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Condensed Consolidating Statements of Income and Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Type of Revenue [Extensible List] | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Net revenues | $ 428,525 | $ 386,110 | $ 347,652 | $ 406,569 | $ 462,659 | $ 457,786 | $ 448,742 | $ 384,457 | $ 1,568,856 | $ 1,753,644 | $ 1,627,222
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Type of Cost Good or Service [Extensible List] |  |  |  |  |  |  |  |  |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Direct advertising expenses |  |  |  |  |  |  |  |  | 557,661 | $ 590,078 | $ 561,848
General and administrative expenses |  |  |  |  |  |  |  |  | 287,874 | 318,380 | 289,428
Depreciation and amortization |  |  |  |  |  |  |  |  | 251,296 | 250,028 | 225,261
(Gain) loss on disposition of assets |  |  |  |  |  |  |  |  | (9,026) | (7,241) | 7,233
Total Operating Expenses |  |  |  |  |  |  |  |  | 1,158,749 | 1,235,903 | 1,166,666
Operating income |  |  |  |  |  |  |  |  | 410,107 | 517,741 | 460,556
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | 25,235 |  | 15,429
Income before income tax expense (benefit) |  |  |  |  |  |  |  |  | 248,046 | 367,889 | 315,929
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 4,660 | (4,222) | 10,697
Net income |  |  |  |  |  |  |  |  | 243,386 | 372,111 | 305,232
Statements of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 243,386 | 372,111 | 305,232
Comprehensive income |  |  |  |  |  |  |  |  | $ 243,635 | $ 372,784 | $ 303,942
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |  |  |  |  |  |  |  |  |
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Net revenues |  |  |  |  |  |  |  |  | $ 1,568,856 | $ 1,753,644 | $ 1,627,222
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Type of Cost Good or Service [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Direct advertising expenses |  |  |  |  |  |  |  |  | $ 557,661 | $ 590,078 | $ 561,848
General and administrative expenses |  |  |  |  |  |  |  |  | 287,874 | 318,380 | 289,428
Corporate expenses |  |  |  |  |  |  |  |  | 70,457 | 84,229 | 82,497
Depreciation and amortization |  |  |  |  |  |  |  |  | 251,296 | 250,028 | 225,261
(Gain) loss on disposition of assets |  |  |  |  |  |  |  |  | (9,026) | (7,241) | 7,233
Total Operating Expenses |  |  |  |  |  |  |  |  | 1,158,262 | 1,235,474 | 1,166,267
Operating income |  |  |  |  |  |  |  |  | 410,594 | 518,170 | 460,955
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | 25,235 |  |
Interest expense (income), net |  |  |  |  |  |  |  |  | 136,826 | 149,852 | 129,198
Other expenses (income) |  |  |  |  |  |  |  |  |  |  | 15,429
Income before income tax expense (benefit) |  |  |  |  |  |  |  |  | 248,533 | 368,318 | 316,328
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 4,660 | (4,222) | 10,697
Net income |  |  |  |  |  |  |  |  | 243,873 | 372,540 | 305,631
Statements of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 243,873 | 372,540 | 305,631
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | 249 | 673 | (1,290)
Comprehensive income |  |  |  |  |  |  |  |  | $ 244,122 | $ 373,213 | $ 304,341
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Lamar Media [Member] |  |  |  |  |  |  |  |  |  |  |
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Type of Cost Good or Service [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | $ 25,235 |  |
Equity in (earnings) loss of subsidiaries |  |  |  |  |  |  |  |  | (404,332) | $ (517,516) | $ (450,791)
Interest expense (income), net |  |  |  |  |  |  |  |  | 135,224 | 144,976 | 129,731
Other expenses (income) |  |  |  |  |  |  |  |  |  |  | 15,429
Income before income tax expense (benefit) |  |  |  |  |  |  |  |  | 243,873 | 372,540 | 305,631
Net income |  |  |  |  |  |  |  |  | 243,873 | 372,540 | 305,631
Statements of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 243,873 | 372,540 | 305,631
Comprehensive income |  |  |  |  |  |  |  |  | $ 243,873 | $ 372,540 | $ 305,631
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Net revenues |  |  |  |  |  |  |  |  | $ 1,536,534 | $ 1,709,691 | $ 1,579,619
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Type of Cost Good or Service [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Direct advertising expenses |  |  |  |  |  |  |  |  | $ 533,803 | $ 564,877 | $ 537,269
General and administrative expenses |  |  |  |  |  |  |  |  | 281,293 | 310,813 | 280,874
Corporate expenses |  |  |  |  |  |  |  |  | 69,478 | 82,652 | 80,861
Depreciation and amortization |  |  |  |  |  |  |  |  | 249,299 | 247,191 | 219,341
(Gain) loss on disposition of assets |  |  |  |  |  |  |  |  | (9,036) | (3,103) | (576)
Total Operating Expenses |  |  |  |  |  |  |  |  | 1,124,837 | 1,202,430 | 1,117,769
Operating income |  |  |  |  |  |  |  |  | 411,697 | 507,261 | 461,850
Interest expense (income), net |  |  |  |  |  |  |  |  | (175) | (149) | (99)
Income before income tax expense (benefit) |  |  |  |  |  |  |  |  | 411,872 | 507,410 | 461,949
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 5,203 | (7,360) | 7,879
Net income |  |  |  |  |  |  |  |  | 406,669 | 514,770 | 454,070
Statements of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 406,669 | 514,770 | 454,070
Comprehensive income |  |  |  |  |  |  |  |  | $ 406,669 | $ 514,770 | $ 454,070
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Net revenues |  |  |  |  |  |  |  |  | $ 33,965 | $ 46,804 | $ 50,352
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Type of Cost Good or Service [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Direct advertising expenses |  |  |  |  |  |  |  |  | $ 25,501 | $ 28,052 | $ 27,307
General and administrative expenses |  |  |  |  |  |  |  |  | 6,581 | 7,567 | 8,554
Corporate expenses |  |  |  |  |  |  |  |  | 979 | 1,577 | 1,636
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,997 | 2,837 | 5,920
(Gain) loss on disposition of assets |  |  |  |  |  |  |  |  | 10 | (4,138) | 7,809
Total Operating Expenses |  |  |  |  |  |  |  |  | 35,068 | 35,895 | 51,226
Operating income |  |  |  |  |  |  |  |  | (1,103) | 10,909 | (874)
Interest expense (income), net |  |  |  |  |  |  |  |  | 1,777 | 5,025 | (413)
Income before income tax expense (benefit) |  |  |  |  |  |  |  |  | (2,880) | 5,884 | (461)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (543) | 3,138 | 2,818
Net income |  |  |  |  |  |  |  |  | (2,337) | 2,746 | (3,279)
Statements of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (2,337) | 2,746 | (3,279)
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | 249 | 673 | (1,290)
Comprehensive income |  |  |  |  |  |  |  |  | $ (2,088) | $ 3,419 | $ (4,569)
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Net revenues |  |  |  |  |  |  |  |  | $ (1,643) | $ (2,851) | $ (2,749)
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Type of Cost Good or Service [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember | us-gaap:AdvertisingMember
Direct advertising expenses |  |  |  |  |  |  |  |  | $ (1,643) | $ (2,851) | $ (2,728)
Total Operating Expenses |  |  |  |  |  |  |  |  | (1,643) | (2,851) | (2,728)
Operating income |  |  |  |  |  |  |  |  |  |  | (21)
Equity in (earnings) loss of subsidiaries |  |  |  |  |  |  |  |  | 404,332 | 517,516 | 450,791
Interest expense (income), net |  |  |  |  |  |  |  |  |  |  | (21)
Income before income tax expense (benefit) |  |  |  |  |  |  |  |  | (404,332) | (517,516) | (450,791)
Net income |  |  |  |  |  |  |  |  | (404,332) | (517,516) | (450,791)
Statements of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (404,332) | (517,516) | (450,791)
Comprehensive income |  |  |  |  |  |  |  |  | $ (404,332) | $ (517,516) | $ (450,791)

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