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Financial Guarantee Insurance Contracts - Summary of Balance of RMBS Subrogation Recoveries and Related Claim Liabilities, by Estimation Approach (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Successor Ambac [Member]
Transactions
Apr. 30, 2013
Successor Ambac [Member]
Dec. 31, 2013
Successor Ambac [Member]
Adverse Samples [Member]
Transactions
Dec. 31, 2013
Successor Ambac [Member]
Random Samples [Member]
Transactions
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Transactions
Dec. 31, 2011
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Adverse Samples [Member]
Transactions
Dec. 31, 2012
Predecessor Ambac [Member]
Random Samples [Member]
Transactions
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items]                  
Count 48   27 21   49   27 22
Gross loss reserve before subrogation recoveries $ 3,163,772   $ 2,084,911 $ 1,078,861   $ 3,563,344   $ 2,331,878 $ 1,231,466
Subrogation recoveries (2,206,598) (2,482,918) (1,252,773) (953,825) (2,482,918) (2,523,225) (2,720,266) (1,442,817) (1,080,408)
Gross loss reserve after subrogation recoveries $ 957,174   $ 832,138 $ 125,036   $ 1,040,119   $ 889,061 $ 151,058