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Long-term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  | 1 Months Ended |  |  |  |  | 1 Months Ended |  |  |  | 1 Months Ended |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 LAMAR MEDIA CORP [Member] | Dec. 31, 2011 LAMAR MEDIA CORP [Member] | Dec. 31, 2010 LAMAR MEDIA CORP [Member] | Dec. 31, 2012 6 5/8% Senior Subordinated Notes [Member] | Aug. 16, 2005 6 5/8% Senior Subordinated Notes [Member] | Dec. 31, 2012 6 5/8% Senior Subordinated Notes [Member] LAMAR MEDIA CORP [Member] | Dec. 31, 2012 6 5/8% Senior Subordinated Notes - Series B [Member] | Aug. 17, 2006 6 5/8% Senior Subordinated Notes - Series B [Member] | Dec. 31, 2012 6 5/8% Senior Subordinated Notes - Series B [Member] LAMAR MEDIA CORP [Member] | Dec. 31, 2012 6 5/8% Senior Subordinated Notes - Series C [Member] | Oct. 11, 2007 6 5/8% Senior Subordinated Notes - Series C [Member] | Dec. 31, 2012 6 5/8% Senior Subordinated Notes - Series C [Member] LAMAR MEDIA CORP [Member] | Mar. 31, 2012 9 3/4% Senior Notes [Member] | Mar. 31, 2009 9 3/4% Senior Notes [Member] | Dec. 31, 2012 9 3/4% Senior Notes [Member] | Dec. 31, 2011 9 3/4% Senior Notes [Member] | Mar. 27, 2009 9 3/4% Senior Notes [Member] | Dec. 31, 2012 9 3/4% Senior Notes [Member] LAMAR MEDIA CORP [Member] | Apr. 30, 2010 7 7/8% Senior Subordinated Notes [Member] | Dec. 31, 2012 7 7/8% Senior Subordinated Notes [Member] | Apr. 22, 2010 7 7/8% Senior Subordinated Notes [Member] | Dec. 31, 2012 7 7/8% Senior Subordinated Notes [Member] LAMAR MEDIA CORP [Member] | Feb. 29, 2012 5 7/8% Senior Subordinated Notes [Member] | Dec. 31, 2012 5 7/8% Senior Subordinated Notes [Member] | Feb. 09, 2012 5 7/8% Senior Subordinated Notes [Member] | Dec. 31, 2012 5 7/8% Senior Subordinated Notes [Member] LAMAR MEDIA CORP [Member] | Dec. 31, 2012 Senior Credit Agreement [Member] | Feb. 09, 2012 Senior Credit Agreement [Member] | Dec. 31, 2012 Letter of Credit [Member] | Feb. 09, 2012 Letter of Credit [Member] | Feb. 09, 2012 Term Loan A-1 Facility [Member] | Feb. 09, 2012 Term loan A-2 Facility [Member] | Feb. 09, 2012 Term Loan A-3 Facility [Member] | Dec. 31, 2012 Term B Facility [Member] | Feb. 09, 2012 Term B Facility [Member] | Feb. 09, 2012 Incremental Facility [Member] | Oct. 31, 2012 5% Senior Subordinated Notes [Member] | Dec. 31, 2012 5% Senior Subordinated Notes [Member] | Oct. 30, 2012 5% Senior Subordinated Notes [Member] | Dec. 31, 2012 5% Senior Subordinated Notes [Member] LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of discount | $ 10,879 |  |  | $ 10,879 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on convertible notes |  |  | 2.875% |  |  |  | 6.625% | 6.625% | 6.625% | 6.625% | 6.625% | 6.625% | 6.625% | 6.625% | 6.625% |  |  | 9.75% | 9.75% | 9.75% | 9.75% |  | 7.875% | 7.875% | 7.875% |  | 5.875% | 5.875% | 5.875% |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00%
Aggregate principal amount of debt issued | 2,171,733 |  |  |  |  |  |  | 400,000 |  |  | 216,000 |  |  | 275,000 |  |  |  |  |  | 350,000 |  |  |  | 400,000 |  |  |  | 500,000 |  |  |  |  |  |  |  |  | 22,164 |  |  |  |  |  |
Principal amount of debt extinguished |  | 47,900 |  |  |  |  | 843,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss (gain) on extinguishment of debt | 41,632 | 677 | 17,398 | 41,632 | 677 | 17,402 | 37,728 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 2,127,720 | 2,141,218 |  | 2,127,720 | 2,141,218 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from the issuance of debt | 1,035,000 |  | 400,000 | 1,035,000 |  | 400,000 |  |  |  |  |  |  |  |  |  |  | 314,927 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 535,000 |  |  |
Net proceeds from the issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 307,489 |  |  |  |  | 392,000 |  |  |  | 489,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 527,100 |  |  |
Description of Interest computation | 360-day year comprised of twelve 30-day months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption percentage of aggregate principal amount of senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  | 35.00% |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |
Additional redeemed percentage of aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109.75% |  |  |  |  | 107.875% |  |  |  | 105.875% |  |  |  |  |  |  |  |  |  |  |  |  |  | 105.00% |  |  |
Redemption percentage equal to principal amount include aggregate premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  | 100.00% |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Redemption price percentage of the principal amount to be purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |
Redemption percentage of issued notes which remain outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |
Repayment of Term B loan under senior credit facility |  |  |  |  |  |  | 295,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 295,000 |  |  |  |  |  |
Purchase of outstanding common stock from proceeds | 1,113 | 3,481 | 1,629 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145,000 |  |
Maximum borrowing limit of incremental loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  | 250,000 | 270,000 | 30,000 | 100,000 |  | 575,000 | 300,000 |  |  |  |
Additional Senior credit facility | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior debt ratio | 3.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity available to subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110,000 |  |  |  |
Non-cash loss on debt extinguishment |  |  |  |  |  |  | 19,285 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,904 |  |  |  |  |  |
Percentage of excess cash flow to repay outstanding debt |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduced percentage of consolidated excess cash flow to repay outstanding loan two |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of indebtedness to net capital minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of indebtedness to net capital one |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Letter of credit outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,689 |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity under revolving credit facility | $ 242,311 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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