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Financial Guarantee Insurance Contracts - Summary of Rollforward of RMBS Subrogation, by Estimation Approach (Detail) (USD $)
In Thousands, unless otherwise specified
 8 Months Ended 4 Months Ended 12 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2013
Successor Ambac [Member]
Transactions
Apr. 30, 2013
Predecessor Ambac [Member]
Transactions
Dec. 31, 2012
Predecessor Ambac [Member]
Transactions
Dec. 31, 2013
Random Samples [Member]
Successor Ambac [Member]
Transactions
Apr. 30, 2013
Random Samples [Member]
Predecessor Ambac [Member]
Transactions
Dec. 31, 2012
Random Samples [Member]
Predecessor Ambac [Member]
Transactions
Dec. 31, 2013
Adverse Samples [Member]
Successor Ambac [Member]
Transactions
Apr. 30, 2013
Adverse Samples [Member]
Predecessor Ambac [Member]
Transactions
Dec. 31, 2012
Adverse Samples [Member]
Predecessor Ambac [Member]
Transactions
Summary Of Rollforward Of Subrogation By Estimation Approach [Line Items]                  
Discounted RMBS subrogation (gross of reinsurance), beginning balance $ 2,482,918 $ 2,523,225 $ 2,720,266 $ 1,004,252 $ 1,080,408 $ 1,262,794 $ 1,478,666 $ 1,442,817 $ 1,457,472
Additional transactions reviewed 2,451    18,981 2,451    54,467      (35,486)
Additional adverse sample loans reviewed                           
Adverse loans repurchased by the sponsor       35               35
Impact of sponsor actions 98 (54,195)      (54,195)    98     
All other changes (278,869) 13,888 (216,057) (52,878) (21,961) (236,853) (225,991) 35,849 20,796
Discounted RMBS subrogation (gross of reinsurance), ending balance $ 2,206,598 $ 2,482,918 $ 2,523,225 $ 953,825 $ 1,004,252 $ 1,080,408 $ 1,252,773 $ 1,478,666 $ 1,442,817
Discounted RMBS subrogation (gross of reinsurance), beginning balance   49   20 22 16 29 27 30
Changes recognized: Additional transactions reviewed       1   6     (1)
Additional adverse sample loans reviewed                        
Adverse loans repurchased by the sponsor                        
Impact of sponsor actions         (2)        
All other changes             (2) 2 (2)
Discounted RMBS subrogation (gross of reinsurance), ending balance 48   49 21 20 22 27 29 27