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Derivative Instruments - Summarize Information by Major Category of CDS Contracts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Predecessor Ambac [Member]
Transactions
Dec. 31, 2012
Predecessor Ambac [Member]
Credit Derivatives [Member]
Dec. 31, 2013
Successor Ambac [Member]
Transactions
Dec. 31, 2013
Successor Ambac [Member]
Credit Derivatives [Member]
Dec. 31, 2012
CLO [Member]
Predecessor Ambac [Member]
Transactions
Dec. 31, 2012
CLO [Member]
Predecessor Ambac [Member]
Credit Derivatives [Member]
Dec. 31, 2013
CLO [Member]
Successor Ambac [Member]
Transactions
Dec. 31, 2013
CLO [Member]
Successor Ambac [Member]
Credit Derivatives [Member]
Dec. 31, 2012
Other [Member]
Predecessor Ambac [Member]
Transactions
Dec. 31, 2012
Other [Member]
Predecessor Ambac [Member]
Credit Derivatives [Member]
Dec. 31, 2013
Other [Member]
Successor Ambac [Member]
Transactions
Dec. 31, 2013
Other [Member]
Successor Ambac [Member]
Credit Derivatives [Member]
Summary of information by major category of CDS contracts                            
Number of CDS transactions     51   20   30   7   21   13  
Remaining expected weighted-average life of obligations (in years)     3 years 7 months 6 days   3 years 7 months 6 days   2 years 2 months 12 days   2 years 1 month 6 days   5 years 2 months 12 days   5 years  
Gross principal notional outstanding $ 2,776,103 $ 11,281,777 $ 11,281,777   $ 2,776,103   $ 6,155,767   $ 1,337,737   $ 5,126,010   $ 1,438,366  
Net derivative liabilities at fair value       $ (213,585)   $ (94,322)   $ (34,645)   $ (7,993)   $ (178,940)   $ (86,329)