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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Exercise of stock options | 522,032 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 682,263 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 586,563 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Purchase of treasury stock | 54,295 us-gaap_TreasuryStockSharesAcquired | 97,430 us-gaap_TreasuryStockSharesAcquired | 36,553 us-gaap_TreasuryStockSharesAcquired
Retirement of treasury stock | 17,270,930 us-gaap_TreasuryStockSharesRetired |  |
Common stock dividends/distributions | $ 2.50 us-gaap_CommonStockDividendsPerShareDeclared |  |
Preferred stock dividend shares | $ 63.80 lamr_PreferredStockDividendShares | $ 63.80 lamr_PreferredStockDividendShares | $ 63.80 lamr_PreferredStockDividendShares
Treasury Stock [Member] |  |  |
Purchase of treasury stock | 54,295 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 97,430 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 36,553 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Retirement of treasury stock | 17,270,930 us-gaap_TreasuryStockSharesRetired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Additional Paid-in Capital [Member] |  |  |
Exercise of stock options | 522,032 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 682,263 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 586,563 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Accumulated Deficit [Member] |  |  |
Common stock dividends/distributions | $ 2.50 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Preferred stock dividend shares | $ 63.80 lamr_PreferredStockDividendShares / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 63.80 lamr_PreferredStockDividendShares / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 63.80 lamr_PreferredStockDividendShares / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember

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