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Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Total Fair Value [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Total Fair Value [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Total Fair Value [Member]
Futures Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Total Fair Value [Member]
Credit Derivatives [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Total Fair Value [Member]
Other Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Carrying Amount [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Carrying Amount [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Carrying Amount [Member]
Futures Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Carrying Amount [Member]
Credit Derivatives [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Carrying Amount [Member]
Other Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Other Assets [Member]
Total Fair Value [Member]
Interest Rate Swaps [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Other Assets [Member]
Carrying Amount [Member]
Interest Rate Swaps [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Interest rate swaps - liability position [Member]
Total Fair Value [Member]
Interest Rate Swaps [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Interest rate swaps - liability position [Member]
Total Fair Value [Member]
Interest Rate Swaps [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Interest rate swaps - liability position [Member]
Total Fair Value [Member]
Currency Swaps [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Interest rate swaps - liability position [Member]
Carrying Amount [Member]
Interest Rate Swaps [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Interest rate swaps - liability position [Member]
Carrying Amount [Member]
Interest Rate Swaps [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Interest rate swaps - liability position [Member]
Carrying Amount [Member]
Currency Swaps [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Municipal Obligations [Member]
Total Fair Value [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Municipal Obligations [Member]
Carrying Amount [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Corporate Obligations [Member]
Total Fair Value [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Corporate Obligations [Member]
Total Fair Value [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Corporate Obligations [Member]
Carrying Amount [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Corporate Obligations [Member]
Carrying Amount [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Foreign Obligations [Member]
Total Fair Value [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Foreign Obligations [Member]
Carrying Amount [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
U.S. Government Obligations [Member]
Total Fair Value [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
U.S. Government Obligations [Member]
Carrying Amount [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
U.S. Agency Obligations [Member]
Total Fair Value [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
U.S. Agency Obligations [Member]
Carrying Amount [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Residential Mortgage-Backed Securities [Member]
Total Fair Value [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Residential Mortgage-Backed Securities [Member]
Carrying Amount [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Collateralized Debt Obligations [Member]
Total Fair Value [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Collateralized Debt Obligations [Member]
Carrying Amount [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Other Commercial Asset-Backed [Member]
Total Fair Value [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Other Commercial Asset-Backed [Member]
Carrying Amount [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Short-Term [Member]
Total Fair Value [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Short-Term [Member]
Carrying Amount [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Other [Member]
Total Fair Value [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Other [Member]
Carrying Amount [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Futures Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Credit Derivatives [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Other Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Other Assets [Member]
Interest Rate Swaps [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Interest rate swaps - liability position [Member]
Currency Swaps [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Municipal Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Corporate Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Corporate Obligations [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Foreign Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
U.S. Government Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
U.S. Agency Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Residential Mortgage-Backed Securities [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Collateralized Debt Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Other Commercial Asset-Backed [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Short-Term [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 1 [Member]
Other [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Futures Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Credit Derivatives [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Other Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Other Assets [Member]
Interest Rate Swaps [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Interest rate swaps - liability position [Member]
Currency Swaps [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Municipal Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Corporate Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Corporate Obligations [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Foreign Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
U.S. Government Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
U.S. Agency Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Residential Mortgage-Backed Securities [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Collateralized Debt Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Other Commercial Asset-Backed [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Short-Term [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 2 [Member]
Other [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Futures Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Credit Derivatives [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Other Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Other Assets [Member]
Interest Rate Swaps [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Interest rate swaps - liability position [Member]
Currency Swaps [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Municipal Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Corporate Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Corporate Obligations [Member]
Variable Interest Entity [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Foreign Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
U.S. Government Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
U.S. Agency Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Residential Mortgage-Backed Securities [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Collateralized Debt Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Other Commercial Asset-Backed [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Short-Term [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Level 3 [Member]
Other [Member]
Jun. 30, 2013
Successor Ambac [Member]
Apr. 30, 2013
Successor Ambac [Member]
Jun. 30, 2013
Successor Ambac [Member]
Variable Interest Entity [Member]
Apr. 30, 2013
Successor Ambac [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Total Fair Value [Member]
Jun. 30, 2013
Successor Ambac [Member]
Total Fair Value [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Total Fair Value [Member]
Futures Contracts [Member]
Jun. 30, 2013
Successor Ambac [Member]
Total Fair Value [Member]
Credit Derivatives [Member]
Jun. 30, 2013
Successor Ambac [Member]
Total Fair Value [Member]
Other Contracts [Member]
Jun. 30, 2013
Successor Ambac [Member]
Carrying Amount [Member]
Jun. 30, 2013
Successor Ambac [Member]
Carrying Amount [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Carrying Amount [Member]
Futures Contracts [Member]
Jun. 30, 2013
Successor Ambac [Member]
Carrying Amount [Member]
Credit Derivatives [Member]
Jun. 30, 2013
Successor Ambac [Member]
Carrying Amount [Member]
Other Contracts [Member]
Jun. 30, 2013
Successor Ambac [Member]
Other Assets [Member]
Total Fair Value [Member]
Interest Rate Swaps [Member]
Jun. 30, 2013
Successor Ambac [Member]
Other Assets [Member]
Carrying Amount [Member]
Interest Rate Swaps [Member]
Jun. 30, 2013
Successor Ambac [Member]
Interest rate swaps - liability position [Member]
Total Fair Value [Member]
Interest Rate Swaps [Member]
Jun. 30, 2013
Successor Ambac [Member]
Interest rate swaps - liability position [Member]
Total Fair Value [Member]
Interest Rate Swaps [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Interest rate swaps - liability position [Member]
Total Fair Value [Member]
Currency Swaps [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Interest rate swaps - liability position [Member]
Carrying Amount [Member]
Interest Rate Swaps [Member]
Jun. 30, 2013
Successor Ambac [Member]
Interest rate swaps - liability position [Member]
Carrying Amount [Member]
Interest Rate Swaps [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Interest rate swaps - liability position [Member]
Carrying Amount [Member]
Currency Swaps [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Municipal Obligations [Member]
Total Fair Value [Member]
Jun. 30, 2013
Successor Ambac [Member]
Municipal Obligations [Member]
Carrying Amount [Member]
Jun. 30, 2013
Successor Ambac [Member]
Corporate Obligations [Member]
Total Fair Value [Member]
Jun. 30, 2013
Successor Ambac [Member]
Corporate Obligations [Member]
Total Fair Value [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Corporate Obligations [Member]
Carrying Amount [Member]
Jun. 30, 2013
Successor Ambac [Member]
Corporate Obligations [Member]
Carrying Amount [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Foreign Obligations [Member]
Total Fair Value [Member]
Jun. 30, 2013
Successor Ambac [Member]
Foreign Obligations [Member]
Carrying Amount [Member]
Jun. 30, 2013
Successor Ambac [Member]
U.S. Government Obligations [Member]
Total Fair Value [Member]
Jun. 30, 2013
Successor Ambac [Member]
U.S. Government Obligations [Member]
Carrying Amount [Member]
Jun. 30, 2013
Successor Ambac [Member]
U.S. Agency Obligations [Member]
Total Fair Value [Member]
Jun. 30, 2013
Successor Ambac [Member]
U.S. Agency Obligations [Member]
Carrying Amount [Member]
Jun. 30, 2013
Successor Ambac [Member]
Residential Mortgage-Backed Securities [Member]
Total Fair Value [Member]
Jun. 30, 2013
Successor Ambac [Member]
Residential Mortgage-Backed Securities [Member]
Carrying Amount [Member]
Jun. 30, 2013
Successor Ambac [Member]
Collateralized Debt Obligations [Member]
Total Fair Value [Member]
Jun. 30, 2013
Successor Ambac [Member]
Collateralized Debt Obligations [Member]
Carrying Amount [Member]
Jun. 30, 2013
Successor Ambac [Member]
Other Commercial Asset-Backed [Member]
Total Fair Value [Member]
Jun. 30, 2013
Successor Ambac [Member]
Other Commercial Asset-Backed [Member]
Carrying Amount [Member]
Jun. 30, 2013
Successor Ambac [Member]
Short-Term [Member]
Total Fair Value [Member]
Jun. 30, 2013
Successor Ambac [Member]
Short-Term [Member]
Carrying Amount [Member]
Jun. 30, 2013
Successor Ambac [Member]
Other [Member]
Total Fair Value [Member]
Jun. 30, 2013
Successor Ambac [Member]
Other [Member]
Carrying Amount [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Futures Contracts [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Credit Derivatives [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Other Contracts [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Other Assets [Member]
Interest Rate Swaps [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Interest rate swaps - liability position [Member]
Currency Swaps [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Municipal Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Corporate Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Corporate Obligations [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Foreign Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
U.S. Government Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
U.S. Agency Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Residential Mortgage-Backed Securities [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Collateralized Debt Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Other Commercial Asset-Backed [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Short-Term [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 1 [Member]
Other [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Futures Contracts [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Credit Derivatives [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Other Contracts [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Other Assets [Member]
Interest Rate Swaps [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Interest rate swaps - liability position [Member]
Currency Swaps [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Municipal Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Corporate Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Corporate Obligations [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Foreign Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
U.S. Government Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
U.S. Agency Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Residential Mortgage-Backed Securities [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Collateralized Debt Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Other Commercial Asset-Backed [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Short-Term [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 2 [Member]
Other [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Futures Contracts [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Credit Derivatives [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Other Contracts [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Other Assets [Member]
Interest Rate Swaps [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Interest rate swaps - liability position [Member]
Interest Rate Swaps [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Interest rate swaps - liability position [Member]
Currency Swaps [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Municipal Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Corporate Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Corporate Obligations [Member]
Variable Interest Entity [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Foreign Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
U.S. Government Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
U.S. Agency Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Residential Mortgage-Backed Securities [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Collateralized Debt Obligations [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Other Commercial Asset-Backed [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Short-Term [Member]
Jun. 30, 2013
Successor Ambac [Member]
Level 3 [Member]
Other [Member]
Financial assets:                                                                                                                                                                                                                                                                                                                                                                                                                                    
Fixed income securities           $ 2,261,294                                     $ 1,848,932 $ 1,848,932 $ 1,077,972 $ 2,261,294 $ 1,077,972 $ 2,261,294 $ 70,112 $ 70,112 $ 127,283 $ 127,283 $ 82,535 $ 82,535 $ 1,455,582 $ 1,455,582 $ 33,342 $ 33,342 $ 706,637 $ 706,637                                       $ 127,283                                   $ 1,848,932 $ 1,074,316    $ 70,112    $ 82,535 $ 1,455,582 $ 26,860 $ 656,373                          $ 3,656 $ 2,261,294             $ 6,482 $ 50,264         $ 2,242,989                                       $ 1,637,190 $ 1,637,190 $ 982,587 $ 2,242,989 $ 982,587 $ 2,242,989 $ 105,191 $ 105,191 $ 250,838 $ 250,838 $ 53,246 $ 53,246 $ 1,520,676 $ 1,520,676 $ 47,618 $ 47,618 $ 987,929 $ 987,929                                       $ 250,838                                   $ 1,637,190 $ 979,166    $ 105,191    $ 53,246 $ 1,520,676 $ 44,203 $ 926,193                          $ 3,421 $ 2,242,989             $ 3,415 $ 61,736    
Restricted cash               2,290         2,290                                                                     2,290                                                                                                                                 22,994         22,994                                                                     22,994                                                                                                                      
Short term investments       661,658                                                                             661,658 661,658                                         657,886                                       3,772                                            611,177                                                                               611,177 611,177                                         595,195                                       15,982                                           
Fixed income securities, pledged as collateral                                                                 265,779 265,779                                                   265,779                                                                                                                                                           164,295 164,295                                                   164,295                                                                                              
Other investments       100                                                                                 100 100                                                                                                                         100 240,417                                                                                   240,417 240,417                                                                                240,317                                       100
Cash             43,837         43,837                                                                     43,837                                                                                                                                 20,515         20,515                                                                     20,515                                                                                                                        
Loans at Carrying Amount                       9,203 15,568,711                                                                                                                                                                                                             7,053 13,820,878                                                                                                                                                                                          
Loans           15,359,073 7,387 15,560,051                                                                                                                          200,978                                     7,387 15,359,073                                         13,820,878   7,179 13,820,878                                                                                                                                                                 7,179 13,820,878                                    
Derivative assets                 1,253         1,253     124,853 124,853                                                             1,253                                               124,853                                                                                   2,852         2,852     91,455 91,455                                                             2,852                                               91,455                                                                      
Derivative assets                                                                                                                                                                                                                                                          (3,129)     (3,129)                                                                                                      (3,129)                                                                   
Other assets 13,884 14,557         14,557         14,557                                                                                                                                                       14,557                                               13,884         13,884                                                                                                                                                       13,884                                      
Total financial assets             24,345,454         24,355,930                                                                     1,098,328                                       5,544,313                                       17,702,813                                               22,820,781         22,820,655                                                                     1,056,689                                       5,610,490                                       16,153,602                                      
Financial liabilities:                                                                                                                                                                                                                                                                                                                                                                                                                                    
Obligations under investment and repurchase agreements     357,373 356,091               362,017                                                                                                                                                                                             358,610 358,878               364,536                                                                                                                                                                                            
Obligations under investment and repurchase agreements             361,905                                                                                                                                                                 361,905                                               365,319                                                                                                                                                                 365,319                                      
Liabilities subject to compromise     1,704,641 1,704,904               1,690,312                                                                                                                                                                                                                                                                                                                                                                                                             
Liabilities subject to compromise             434,823                                                                                                                        434,823                                                                                                                                                                                                                                                                                               
Long term debt, including accrued interest     155,271 150,170 15,041,624 15,436,008 801,277         377,524                                                                                                                                                       801,277                                       945,940 940,313 14,268,493 15,023,038 1,186,821         1,193,830                                                                                                                                                       1,186,821                                      
Derivative liabilities                                 (73,264) (73,264)   2,131,315     2,131,315                                                                                                   (73,264)   2,131,315                                                                                               (53,252) (53,252)   1,897,311     1,897,311                                                                                                   (53,252)   1,897,311                                                                  
Derivative liabilities 232,267 213,585                213,585 220        213,585 220     390,774   90,466 390,774   90,466                                                                                                    220   282,022   90,466                              213,585      108,752                                           232,267 192        232,267 192     272,583   92,472 272,583   92,472                                                                                                    192   164,187   92,472                              232,267      108,396                           
Liabilities for net financial guarantees written             3,091,257         7,074,808                                                                                                                                                       3,091,257                                               4,809,530         4,634,297                                                                                                                                                       4,809,530                                      
Long-term debt           15,200,538   15,414,233         15,436,008                                                                                                              12,457,732                                       2,956,501                                         14,262,734     14,268,493         14,268,493                                                                                                              12,694,806                                       1,573,687                                    
Total financial liabilities             $ 22,856,591         $ 27,693,765                                                                                                              $ 15,323,314                                       $ 7,533,277                                               $ 23,071,736         $ 22,902,729                                                                                                              $ 14,795,716                                       $ 8,276,020