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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Jul. 16, 2010 | Dec. 31, 2008
Income Taxes |  |  |  |  |  |  |
Income tax expense (benefit) | $ 2,363,000 | $ 173,000 | $ 7,300,000 | $ (100,373,000) |  |  |
Deferred tax assets, gross | 4,702,000 |  | 4,702,000 |  |  |  |
Accrued income taxes, current | 4,702,000 |  | 4,702,000 |  |  |  |
Valuation allowance, deferred tax asset, change in amount |  |  | 4,702,000 | (100,288,000) |  |  |
Current state income tax expense | 1,676,000 | 173,000 | 2,598,000 | (14,000) |  |  |
Federal net operating loss carryforwards subject to the IRC Section 382 limitation |  |  |  |  |  | 629,800,000 | 298,400,000
Unrecognized tax benefits | 1,900,000 |  | 1,900,000 |  | 1,300,000 |  |
Unrecognized tax benefits that would affect the effective tax rate if recognized | 1,200,000 |  | 1,200,000 |  |  |  |
Unrecognized tax benefits, accrued liability | 200,000 |  | 200,000 |  | 200,000 |  |
Decrease in gross unrecognized tax benefits balance within next twelve months | 1,600,000 |  | 1,600,000 |  |  |  |
Arena Acquisition |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Federal net operating loss carryforwards subject to the IRC Section 382 limitation |  |  |  |  |  | 119,900,000 |
Beginning tax year |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Beginning tax year, years open for federal examination |  |  | 2010 |  |  |  |
Beginning tax year as result of federal NOL carryforwards |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Beginning tax year, years open for federal examination |  |  | 2003 |  |  |  |
Minimum |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Number of tax years open for state tax audit (in years) |  |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Number of tax years open for state tax audit (in years) |  |  | 5 years |  |  |  |
Parent Company |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Income tax expense (benefit) | 2,267,000 | 43,000 | 7,058,000 | (100,660,000) |  |  |
Current state income tax expense |  |  | 2,400,000 |  |  |  |
Parent Company | Federal Alternative Minimum Tax |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Income tax expense (benefit) |  |  | $ 7,058,000 |  |  |  |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(1) -Article 7 + Details
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