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Federal Income Taxes - Components of Net Deferred Tax Asset (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Deferred federal income tax asset: |  |  |
Losses and loss adjustments expenses | $ 2,832 | $ 4,097 | $ 5,906
Net operating loss carryforward | 2,088,461 | 5,013 | 43
Accruals and reserves | 18,276 |  |
Accrual class action settlement |  | 1,400 | 1,400
Total deferred federal income tax asset | 2,109,569 | 10,510 | 7,349
Deferred federal income tax liabilities: |  |  |
Net unrealized gains on investments | 1,946 | 1,774 | 2,764
Total deferred federal income tax liabilities | 1,946 | 1,774 | 2,764
Less: Valuation allowance | 2,107,623 | 8,736 | 4,585
Net deferred federal income tax asset |  |  |

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