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Income Taxes - Components of Net Deferred Tax Asset (Liability) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Schedule Of Balance Sheet Classification Of Net Deferred Income Tax Assets Liabilities [Line Items] |  |
Federal Net operating loss carry-forward | $ 29,990 | $ 28,116
State Net operating loss carry-forward | 5,066 | 4,841
Capital loss carry-forward | 25,283 | 19,834
Unrealized loss on investment in the Operating LLC | 113,398 | 114,121
Other | 1,253 | 6,730
Ending deferred tax asset/(liability) | 174,990 | 173,642
Less: Deferred tax asset valuation allowance | (167,498) | (166,963)
Net deferred tax asset/(liability) | 7,492 | 6,679
Unrealized gain on debt | (14,095) | (14,179)
Ending deferred tax asset/(liability) | (14,095) | (14,179)
Net deferred tax asset/(liability) | (14,095) | (14,179)
Federal Net operating loss carry-forward | 29,990 | 28,116
State Net operating loss carry-forward | 5,066 | 4,841
Capital loss carry-forward | 25,283 | 19,834
Unrealized gain on debt | (14,095) | (14,179)
Unrealized loss on investment in the Operating LLC | 113,398 | 114,121
Other | 1,253 | 6,730
Ending deferred tax asset/(liability) | 160,895 | 159,463
Less: Deferred tax asset valuation allowance | (167,498) | (166,963)
Net deferred tax asset/(liability) | $ (6,603) | $ (7,500)

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