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Income Taxes - Components of Net Deferred Tax Asset (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Deferred federal income tax asset: |  |  |
Net operating loss carryforward | $ 2,102,482 | $ 2,098,597 | $ 2,087,490
Accruals and reserves | 3,481 | 4,531 | 16,387
Derivative liabilities | 19,117 |  |
Losses and loss adjustments expense |  |  | 143
Restricted stock grants | 160 |  |
As filed adjustments |  | 214 | 130
Net unrealized loss on investments | 16 |  |
Capital loss carryforward | 52,490 | 52,603 | 52,756
Total deferred federal income tax asset | 2,177,746 | 2,155,945 | 2,156,906
Deferred federal income tax liabilities: |  |  |
Net unrealized gain on investments |  | 154 | 425
Losses and loss adjustments expense | 411 | 102 |
Total deferred federal income tax liabilities | 411 | 256 | 425
Less: Valuation allowance | $ 2,177,335 | 2,155,689 | 2,156,481
Net deferred federal income tax asset |  | $ 0 | $ 0

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