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Background and Business Description - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 | Apr. 30, 2013
Background And Basis Of Presentation [Line Items] |  |
Common stock, shares issued | 45,000,000 |
Warrants issued exercise price | 16.67 |
Amount transferred to escrow account |  | $ 30,000
Capital stock, shares authorized |  | 150,000,000
Common stock, shares authorized |  | 130,000,000
Common stock, par value | $ 0.01 | $ 0.01
Preferred stock, shares authorized |  | 20,000,000
Preferred stock, par value |  | $ 0.01
Percentage of voting rights, common stock | 10.00% |
Beneficial ownership | 5.00% |
Existing beneficial ownership | 5.00% |
Available secured notes including capitalized interest | 278,706 |
Minimum surplus amount | 100,000 |
Insurance liabilities allocated to segregated account | 6,150,172 |
Segregated Account's insurance liabilities | 393,730 |
Percentage of permitted policy claim | 25.00% |
Accrued rate of interest on outstanding policy obligations | 5.10% |
Bankruptcy [Member] |  |
Background And Basis Of Presentation [Line Items] |  |
Common stock, shares issued |  | 45,000,000
5.1% junior surplus notes, segregated account, due 2020 [Member] |  |
Background And Basis Of Presentation [Line Items] |  |
Segregated Account issue of junior surplus notes |  | 350,000
Senior debt securities [Member] | Bankruptcy [Member] |  |
Background And Basis Of Presentation [Line Items] |  |
Common stock, shares issued |  | 43,946,750
Common stock, value |  | 1,246,129
General unsecured claims [Member] |  |
Background And Basis Of Presentation [Line Items] |  |
Shares reserved for future issuance |  | 10,000
Warrants issued |  | 42,424
Warrants issued exercise price |  | 16.67
General unsecured claims [Member] | Bankruptcy [Member] |  |
Background And Basis Of Presentation [Line Items] |  |
Common stock, shares issued |  | 378,250
Common stock, value |  | 14,328
Subordinated debt securities [Member] |  |
Background And Basis Of Presentation [Line Items] |  |
Warrants issued |  | 5,004,714
Warrants issued exercise price |  | 16.67
Subordinated debt securities [Member] | Bankruptcy [Member] |  |
Background And Basis Of Presentation [Line Items] |  |
Common stock, shares issued |  | 675,000
Common stock, value |  | 444,183
Segregated Account [Member] |  |
Background And Basis Of Presentation [Line Items] |  |
Settlement disputes |  | 100,000
Ambac [Member] |  |
Background And Basis Of Presentation [Line Items] |  |
Settlement disputes |  | 1,900
Ambac Assurance [Member] |  |
Background And Basis Of Presentation [Line Items] |  |
Net par exposure for policies allocated to the Segregated Account | 24,718,999 |
Issuance of secured note to segregated account | $ 2,000,000 |
Secured note maturity year | 2050 |
Interest on the secured note accrues | 4.50% |

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