Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 209,539	$ 230,512
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	167,251	155,003
Stock-based compensation	22,745	7,060
Amortization included in interest expense	3,662	3,866
Loss (gain) on disposition of assets and investments	7,265	(4,377)
Loss on extinguishment of debt	15,429	71
Deferred tax expense	1,575	259
Provision for doubtful accounts	5,547	6,009
(Increase) decrease in:
Receivables	(31,672)	(38,083)
Prepaid lease expenses	(24,989)	(23,281)
Other assets	1,698	(4,334)
Increase (decrease) in:
Trade accounts payable	1,268	401
Accrued expenses	(20,708)	(21,768)
Other liabilities	11,479	9,300
Net cash provided by operating activities	370,089	320,638
Cash flows from investing activities:
Acquisitions	(48,141)	(119,936)
Capital expenditures	(82,174)	(74,446)
Proceeds received from property insurance claims	4,222
Proceeds from disposition of assets and investments	5,760	3,340
Decrease in notes receivable	7	13
Net cash (used in) provided by investing activities	(120,326)	(191,029)
Cash flows from financing activities:
Cash used for purchase of treasury stock	(4,112)	(8,997)
Net proceeds from issuance of common stock	31,990	19,817
Principal payments on long-term debt	(20,119)	(11,250)
Payment on revolving credit facility	(368,000)	(407,000)
Proceeds received from revolving credit facility	275,000	317,000
Redemption of senior subordinated notes	(509,790)
Payment on senior credit facility term loans		(247,500)
Proceeds received from senior credit facility term loans	599,250	450,000
Debt issuance costs	(6,374)	(4,941)
Distributions to non-controlling interest	(388)	(415)
Dividends/distributions	(351,400)	(244,201)
Net cash (used in) provided by financing activities	(353,943)	(137,487)
Effect of exchange rate changes in cash and cash equivalents	(682)	1,767
Net (decrease) increase in cash and cash equivalents	(104,862)	(6,111)
Cash and cash equivalents at beginning of period	115,471	35,530
Cash and cash equivalents at end of period	10,609	29,419
Supplemental disclosures of cash flow information:
Cash paid for interest	110,576	104,966
Cash paid for foreign, state and federal income taxes	7,983	9,969
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Cash flows from operating activities:
Net income	209,843	230,809
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	167,251	155,003
Stock-based compensation	22,745	7,060
Amortization included in interest expense	3,662	3,866
Loss (gain) on disposition of assets and investments	7,265	(4,377)
Loss on extinguishment of debt	15,429	71
Deferred tax expense	1,575	259
Provision for doubtful accounts	5,547	6,009
(Increase) decrease in:
Receivables	(31,672)	(38,083)
Prepaid lease expenses	(24,989)	(23,281)
Other assets	1,714	(4,334)
Increase (decrease) in:
Trade accounts payable	1,268	401
Accrued expenses	(20,708)	(21,768)
Other liabilities	(15,643)	(13,033)
Net cash provided by operating activities	343,287	298,602
Cash flows from investing activities:
Acquisitions	(48,141)	(119,936)
Capital expenditures	(82,174)	(74,446)
Proceeds received from property insurance claims	4,222
Proceeds from disposition of assets and investments	5,760	3,340
Decrease in notes receivable	7	13
Net cash (used in) provided by investing activities	(120,326)	(191,029)
Cash flows from financing activities:
Principal payments on long-term debt	(20,119)	(11,250)
Payment on revolving credit facility	(368,000)	(407,000)
Proceeds received from revolving credit facility	275,000	317,000
Redemption of senior subordinated notes	(509,790)
Payment on senior credit facility term loans		(247,500)
Proceeds received from senior credit facility term loans	599,250	450,000
Debt issuance costs	(6,374)	(4,941)
Distributions to non-controlling interest	(388)	(415)
Contributions from parent	58,427	41,580
Dividend to parent	(355,147)	(252,925)
Net cash (used in) provided by financing activities	(327,141)	(115,451)
Effect of exchange rate changes in cash and cash equivalents	(682)	1,767
Net (decrease) increase in cash and cash equivalents	(104,862)	(6,111)
Cash and cash equivalents at beginning of period	114,971	35,030
Cash and cash equivalents at end of period	10,109	28,919
Supplemental disclosures of cash flow information:
Cash paid for interest	110,576	104,966
Cash paid for foreign, state and federal income taxes	$ 7,983	$ 9,969