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Stock Compensation Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting terms | Vesting terms ranging from three to five years which primarily includes 1) options that vest in one-fifth increments beginning on the grant date and continuing on each of the first four anniversaries of the grant date and 2) options that cliff-vest on the fifth anniversary of the grant date. |  |
Accrued expenses, liability | $ 13,283 lamr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAccruedLiabilities | $ 6,757 lamr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAccruedLiabilities |
Period of graded vesting for option valuation | 4 years |  |
Period of cliff vesting for option valuation | 5 years |  |
Expected dividend yield | 2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Total unrecognized compensation cost related to nonvested awards | 17,017 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized | 1 year 6 months 18 days |  |
Shares available for future stock option and restricted share grants to employees and directors under existing plans | 2,632,628 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |
Aggregate intrinsic value of options outstanding | 55,169 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue |  |
Aggregate intrinsic value of options exercisable | 42,350 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |
Total intrinsic value of options exercised | 10,806 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Range of awards of target number of share | 0.00%lamr_RangeOfAwardsOfTargetNumberOfShare / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 5 years |  |
Range of awards of target number of share | 100.00%lamr_RangeOfAwardsOfTargetNumberOfShare / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Restricted Stock Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration date of options granted under equity incentive plan | 10 years |  |
2009 Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for future stock option and restricted share grants to employees and directors under existing plans | 307,448 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = lamr_TwoThousandNineEmployeeStockPurchasePlanMember | 327,689 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = lamr_TwoThousandNineEmployeeStockPurchasePlanMember |
Performance Based Compensation [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense related to performance based compensation agreements | $ 14,210 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = lamr_PerformanceBasedCompensationMember |  |
Common Class A [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected Volatility | 90.00%lamr_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsHistoricalVolatilityRate / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Volatility rate on publicly traded options | 10.00%lamr_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsImpliedVolatilityRateOnPubliclyTradedOptions / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Common Class A [Member] | 1996 Equity Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
New employee stock purchase plan, which reserved additional shares of common stock | 15,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = lamr_OneThousandNineHundredNinetySixEquityIncentivePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Common Class A [Member] | 2009 Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
New employee stock purchase plan, which reserved additional shares of common stock | 588,154 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = lamr_TwoThousandNineEmployeeStockPurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Employee stock purchase plan, which available for issuance of common stock | 88,154 lamr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesReservedForAvailableForIssuance / us-gaap_AwardTypeAxis = lamr_TwoThousandNineEmployeeStockPurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Additional shares reserved under 2009 ESPP | 80,209 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_AwardTypeAxis = lamr_TwoThousandNineEmployeeStockPurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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