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Stockholders' Equity - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Jul. 16, 1999 | Dec. 31, 2013 | Dec. 11, 2014
Class of Stock [Line Items] |  |  |  |
Liquidation value of outstanding preferred stock | $ 3,649,000 lamr_PreferredStockLiquidationValue |  |  |
Preferred stock voting right | Series AA preferred stock is entitled to one vote per share and the Class A preferred stock is not entitled to vote |  |  |
Class B common stock voting rights | Holders of Class B common stock have ten votes per share on all matters in which the holders of common stock are entitled to vote and holders of Class A common stock have one vote per share on such matters |  |  |
Treasury stock retired shares | 17,270,930 us-gaap_TreasuryStockSharesRetired |  |  |
Treasury stock retired value | 896,818,000 us-gaap_TreasuryStockRetiredParValueMethodAmount |  |  |
Authorized amount of Stock repurchase | 0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  |
Treasury Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury stock retired shares | 17,270,930 us-gaap_TreasuryStockSharesRetired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Treasury stock retired value | (896,818,000)us-gaap_TreasuryStockRetiredParValueMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Additional Paid-in Capital [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury stock retired value | 896,801,000 us-gaap_TreasuryStockRetiredParValueMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Series AA Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized | 5,720 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = lamr_SeriesAaPreferredStockMember | 5,720 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = lamr_SeriesAaPreferredStockMember | 5,720 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = lamr_SeriesAaPreferredStockMember |
Preferred stock, par value | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = lamr_SeriesAaPreferredStockMember | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = lamr_SeriesAaPreferredStockMember | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = lamr_SeriesAaPreferredStockMember |
Preferred stock, outstanding | 5,720 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = lamr_SeriesAaPreferredStockMember |  | 5,720 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = lamr_SeriesAaPreferredStockMember |
Dividends paid to preferred stock |  | $ 15.95 us-gaap_PreferredStockDividendRatePerDollarAmount / us-gaap_StatementClassOfStockAxis = lamr_SeriesAaPreferredStockMember |  |
Amount entitled |  | $ 638 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = lamr_SeriesAaPreferredStockMember |  |
Preferred Class A [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized | 0 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | 1,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | 10,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember |
Preferred stock, par value | $ 638 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | $ 638 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | $ 638 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember |
Preferred stock, outstanding | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember |
Dividends paid to preferred stock |  | $ 15.95 us-gaap_PreferredStockDividendRatePerDollarAmount / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember |  |
Amount entitled |  | $ 638 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredClassAMember |  |
Common Class A [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Authorized amount of Stock repurchase |  |  |  | 250,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Class A [Member] | Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury stock retired value | $ 17,000 us-gaap_TreasuryStockRetiredParValueMethodAmount / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |

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- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
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