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Income Taxes - Components of Deferred Taxes (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts | $ 2,964 | $ 2,954
Accrued liabilities not deducted for tax purposes | 35,580 | 33,583
Asset retirement obligation | 65,994 | 61,565
Net operating loss carry forward | 155,154 | 148,913
Tax credit carry forwards | 3,765 | 3,724
Charitable contributions carry forward | 592 | 469
Gross deferred tax assets | 264,049 | 251,208
Less: valuation allowance | (3,424) | (3,755)
Net deferred tax assets | 260,625 | 247,453
Deferred tax liabilities: |  |
Property, plant and equipment | (48,271) | (36,967)
Intangibles | (308,266) | (291,926)
Investment in partnerships | (1,244) | (1,065)
Gross deferred tax liabilities | (357,781) | (329,958)
Net deferred tax liabilities | (97,156) | (82,505)
Classification in the consolidated balance sheets: |  |
Current deferred tax assets | 10,817 | 9,812
Current deferred tax liabilities |  |
Noncurrent deferred tax assets |  |
Noncurrent deferred tax liabilities | (107,973) | (92,317)
Net deferred tax liabilities | (97,156) | (82,505)
LAMAR MEDIA CORP [Member] |  |
Deferred tax assets: |  |
Allowance for doubtful accounts | 2,964 | 2,954
Accrued liabilities not deducted for tax purposes | 35,580 | 33,583
Asset retirement obligation | 65,994 | 61,565
Net operating loss carry forward | 105,918 | 99,811
Tax credit carry forwards | 18,537 | 18,496
Charitable contributions carry forward | 592 | 469
Gross deferred tax assets | 229,585 | 216,878
Less: valuation allowance | (2,851) | (3,205)
Net deferred tax assets | 226,734 | 213,673
Deferred tax liabilities: |  |
Property, plant and equipment | (48,271) | (36,967)
Intangibles | (307,630) | (291,291)
Investment in partnerships | (1,244) | (1,065)
Gross deferred tax liabilities | (357,145) | (329,323)
Net deferred tax liabilities | (130,411) | (115,650)
Classification in the consolidated balance sheets: |  |
Current deferred tax assets | 10,817 | 9,812
Current deferred tax liabilities |  |
Noncurrent deferred tax assets |  |
Noncurrent deferred tax liabilities | (141,228) | (125,462)
Net deferred tax liabilities | $ (130,411) | $ (115,650)

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- Definition Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or 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 109 -Paragraph 41, 42 -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 -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31917-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31931-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e31958-109318 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 11 -Subparagraph d, e, f -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -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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