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Significant Accounting Policies - Revenue and Expense Recognized for Advertising Barter Transactions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenue Recognition [Line Items] |  |  |
Net revenues | $ 6,798 | $ 7,153 | $ 6,608
Direct advertising expenses | 2,900 | 2,766 | 2,768
General and administrative expenses | $ 3,699 | $ 3,524 | $ 3,242

X
- Definition Amount included in direct advertising expenses related to barter transactions for the period. + References No definition available. + Details
Name: | lamr_AdvertisingBarterTransactionDirectAdvertisingExpenses
Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount included in general and administrative expenses related to barter transactions for the period. + References No definition available. + Details
Name: | lamr_AdvertisingBarterTransactionGeneralAndAdministrativeExpenses
Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount included in advertising revenue related to barter transactions for the period. + References No definition available. + Details
Name: | lamr_AdvertisingBarterTransactionNetRevenue
Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | lamr_RevenueRecognitionLineItems
Namespace Prefix: | lamr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration