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Income Taxes - Components of Net Deferred Tax Asset (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Deferred federal income tax asset: |  |  |
Net operating loss carryforward | $ 2,104,944 | $ 2,102,482 | $ 2,098,597
Accruals and reserves | 2,177 | 3,481 | 4,531
Derivative liability |  | 19,117 |
Restricted stock grants | 157 | 160 |
As filed adjustments |  |  | 214
Net unrealized loss on investments | 23 | 16 |
Capital loss carryforward | 52,475 | 52,490 | 52,603
Total deferred federal income tax asset | 2,159,776 | 2,177,746 | 2,155,945
Deferred federal income tax liabilities: |  |  |
Net unrealized gain on investments |  |  | 154
Losses and loss adjustments expense | 500 | 411 | 102
Derivative asset | 51,407 |  |
Total deferred federal income tax liabilities | 51,907 | 411 | 256
Less: Valuation allowance | 2,107,869 | 2,177,335 | 2,155,689
Net deferred federal income tax asset | $ 0 | $ 0 | $ 0

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