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Income Taxes - Components of Net Deferred Tax Asset (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Deferred federal income tax asset:    
Losses and loss adjustments expenses $ 143 $ 2,832
Net operating loss carryforward 2,087,490 2,088,461
Accruals and reserves 16,387 18,276
As filed adjustments 130  
Capital loss carryforward 52,756  
Total deferred federal income tax asset 2,156,906 2,109,569
Deferred federal income tax liabilities:    
Net unrealized gains on investments 425 1,946
Total deferred federal income tax liabilities 425 1,946
Less: Valuation allowance 2,156,481 2,107,623
Net deferred federal income tax asset