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Common and Preferred Stock (Narrative) (Detail) (USD $) | 12 Months Ended |  | 0 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended | 83 Months Ended |  | 12 Months Ended |  |  |  |  |  |  | 0 Months Ended
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Dec. 31, 2013 | Dec. 31, 2011 | Dec. 31, 2012 | May 06, 2013 Blue Ridge [Member] | Aug. 05, 2013 Warburg Pincus [Member] | Dec. 31, 2013 Preferred Stock [Member] MBIA Insurance Corporation [Member] | Feb. 01, 2007 2007 Repurchase Authorization [Member] | Dec. 31, 2013 2007 Repurchase Authorization [Member] | Dec. 31, 2013 2007 Repurchase Authorization [Member] | Dec. 31, 2013 Unaffiliated Investors [Member] MBIA Insurance Corporation [Member] | Dec. 31, 2013 Long-Term Incentive Plan [Member] | Dec. 31, 2012 Long-Term Incentive Plan [Member] | Aug. 05, 2013 Warrant [Member] Warburg Pincus [Member] | Dec. 31, 2008 Warrant [Member] Warburg Pincus [Member] | Aug. 05, 2013 B Warrants [Member] Warburg Pincus [Member] | Dec. 31, 2008 B Warrants [Member] Warburg Pincus [Member] | Aug. 05, 2013 B2 Warrants [Member] Warburg Pincus [Member] | Dec. 31, 2008 B2 Warrants [Member] Warburg Pincus [Member] | Aug. 05, 2013 Grossup Warrant [Member] Warburg Pincus [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants outstanding |  |  |  | 9,940,000 | 1,910,000 |  |  |  |  |  |  |  | 11,800,000 | 11,500,000 | 10,100,000 | 9,800,000 | 4,004,945 | 4,000,000 | 1,910,000
Warrant exercise price |  |  |  | 9.59 | 9.59 |  |  |  |  |  |  |  | 29.44 | 30.25 | 29.44 | 30.25 | 16.18 | 16.20 | 9.59
Warrant Term |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years
Fair value of warrants | $ 59,000,000 |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized repurchase of common stock, value |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock shares acquired |  |  |  |  |  |  |  |  | 56,700,000 |  | 392,056 | 8,784 |  |  |  |  |  |  |
Treasury stock value acquired cost method | 7,000,000 | 50,000,000 |  |  |  |  |  |  | 977,000,000 |  |  |  |  |  |  |  |  |  |
Shares repurchased under share repurchase program, average price per share |  |  |  |  |  | $ 10,900 |  |  | $ 17.24 |  |  |  |  |  |  |  |  |  |
Remaining amount available under repurchase program |  |  |  |  |  |  |  | 23,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued | 0 |  | 0 |  |  | 2,759 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock repurchased during period shares |  |  |  |  |  | 1,444 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares outstanding | 0 |  | 0 |  |  |  |  |  |  | 1,315 |  |  |  |  |  |  |  |  |
Preferred stock, carrying value issued and outstanding |  |  |  |  |  | $ 28,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of repurchased preferred stock |  |  |  |  |  | 10.90% |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Par Or Stated Value Per Share | $ 1 |  | $ 1 |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate on preferred stock determined rate |  |  |  |  |  | LIBOR plus 200 basis points |  |  |  |  |  |  |  |  |  |  |  |  |
Period of non payment of dividends on preferred stock, months |  |  |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new directors elected |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |

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