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Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended 3 Months Ended 5 Months Ended 3 Months Ended 5 Months Ended 3 Months Ended 5 Months Ended 3 Months Ended 5 Months Ended 3 Months Ended 5 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 3 Months Ended 5 Months Ended 3 Months Ended 5 Months Ended 3 Months Ended 5 Months Ended 3 Months Ended 5 Months Ended 3 Months Ended 5 Months Ended 3 Months Ended 5 Months Ended 3 Months Ended 5 Months Ended
Sep. 30, 2012
Predecessor Ambac [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Investment by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Investment by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Derivatives by Class [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Derivatives by Class [Member]
Sep. 30, 2013
Predecessor Ambac [Member]
Derivatives by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Derivatives by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Other Asset Backed Securities [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Other Asset Backed Securities [Member]
Investment by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Other Asset Backed Securities [Member]
Investment by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
U.S. Agency Obligations [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
U.S. Agency Obligations [Member]
Investment by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
U.S. Agency Obligations [Member]
Investment by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Collateralized Debt Obligations [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Collateralized Debt Obligations [Member]
Investment by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Collateralized Debt Obligations [Member]
Investment by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Corporate Obligations [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Corporate Obligations [Member]
Investment by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Corporate Obligations [Member]
Investment by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Interest Rate Swaps [Member]
Derivatives by Class [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Interest Rate Swaps [Member]
Derivatives by Class [Member]
Sep. 30, 2013
Predecessor Ambac [Member]
Interest Rate Swaps [Member]
Derivatives by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Interest Rate Swaps [Member]
Derivatives by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Credit Derivatives [Member]
Derivatives by Class [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Credit Derivatives [Member]
Derivatives by Class [Member]
Sep. 30, 2013
Predecessor Ambac [Member]
Credit Derivatives [Member]
Derivatives by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Credit Derivatives [Member]
Derivatives by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Call Options on Long-Term Debt [Member]
Derivatives by Class [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Call Options on Long-Term Debt [Member]
Derivatives by Class [Member]
Sep. 30, 2013
Predecessor Ambac [Member]
Call Options on Long-Term Debt [Member]
Derivatives by Class [Member]
Sep. 30, 2012
Predecessor Ambac [Member]
Call Options on Long-Term Debt [Member]
Derivatives by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Investment by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Investment by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Derivatives by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Other Asset Backed Securities [Member]
Investment by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Other Asset Backed Securities [Member]
Investment by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
U.S. Agency Obligations [Member]
Investment by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
U.S. Agency Obligations [Member]
Investment by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Collateralized Debt Obligations [Member]
Investment by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Collateralized Debt Obligations [Member]
Investment by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Corporate Obligations [Member]
Investment by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Corporate Obligations [Member]
Investment by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Interest Rate Swaps [Member]
Derivatives by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Credit Derivatives [Member]
Derivatives by Class [Member]
Sep. 30, 2013
Successor Ambac [Member]
Call Options on Long-Term Debt [Member]
Derivatives by Class [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor Ambac [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Investments Contract [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor Ambac [Member]
Investments Contract [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Investments Contract [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Loans [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor Ambac [Member]
Loans [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Loans [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Long-Term Debt [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor Ambac [Member]
Long-Term Debt [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Long-Term Debt [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Investments [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor Ambac [Member]
Investments [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Investments [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Other Assets [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor Ambac [Member]
Other Assets [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Other Assets [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Derivatives Assets [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor Ambac [Member]
Derivatives Assets [Member]
Sep. 30, 2012
Level 3 [Member]
Predecessor Ambac [Member]
Derivatives Assets [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Investments Contract [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Investments Contract [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Loans [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Loans [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Long-Term Debt [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Long-Term Debt [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Investments [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Investments [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Other Assets [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Other Assets [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Derivatives Assets [Member]
Sep. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Derivatives Assets [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                                                                                                                                                                
Balance, beginning of period $ 63,770 $ 60,402 $ 97,522 $ (507,604) $ (322,337) $ (415,360) $ (486,775) $ 50,746 $ 50,264 $ 75,886       $ 1,224 $ 9,558 $ 6,482 $ 12,482 $ 3,466 $ 3,656 $ 7,930 $ (295,987) $ (108,752) $ (137,947) $ (302,177) $ (211,617) $ (213,585) $ (277,413) $ (190,653)          $ 6,055 $ 68,572 $ 69,412 $ (340,663) $ 61,736 $ 61,782       $ 3,415 $ 3,949 $ 3,421 $ 3,681 $ (108,396) $ (232,267)    $ 13,626,233 $ 14,416,488 $ 14,019,216 $ 2,162,062 $ 2,261,294 $ 2,199,338 $ 14,238,273 $ 15,359,073 $ 14,126,994 $ (2,346,060) $ (2,956,501) $ (1,934,642) $ 63,770 $ 60,402 $ 97,522 $ 15,792 $ 14,557 $ 16,779 $ (507,604) $ (322,337) $ (486,775) $ 14,231,973 $ 15,170,359 $ 2,242,989 $ 2,500,565 $ 13,820,878 $ 14,752,053 $ (1,573,687) $ (1,750,372) $ 68,572 $ 69,412 $ 13,884 $ 14,061 $ (340,663) $ (415,360)
Additions of VIEs consolidated                                                                                                                                 (409,300)                         (409,300)                                                                        
Included in earnings (22) (33) 17 26,285 (88,546) 107,253 67,322                (2) (2) (6) (5) (20) (27) 24 (1,156) (28,162) 24,838 (46,191) 27,441 (60,384) 82,415 12,803          100,710 467 863 37,126 483 876       7 25 (23) (38) 5,931 31,195    367,070 1,057,181 527,590 (64,826) 328,768 (127,539) 439,649 956,402 738,121 (33,245) (138,914) (148,573) (22) (33) 17 (771) (496) (1,758) 26,285 (88,546) 67,322 291,195 (429,751) 36,694 (172,304) 195,305 (391,336) 21,816 26,163 467 863 (213) (390) 37,126 107,253
Included in other comprehensive income 471 12,329 6,697             122 12,117 6,498       (9) 200 160 492 149 52 (284)                                     5,951 6,013    5,923 6,242       (7) (19) 35 (210)          386,830 (776,014) 558,465 62,877 (89,497) 88,314 392,548 (849,833) 541,215 (69,066) 150,987 (77,761) 471 12,329 6,697                   916,364 613,641 144,231 95,653 842,715 560,294 (76,533) (48,319) 5,951 6,013            
Purchases                                                                                                                                                                                                                                                
Issuances                                                                                                                                                                                                                                                
Sales                                                                                                                                                                                                                                                
Settlements (3,497) (3,286) (96,118) 7,278 (4,477) 2,433 (54,588) (573) (599) (85,157)       (749) (2,924) (2,687) (6,137)       (4,075) 10,223 (1,033) 10,088 61,448 (2,945) (3,444) (7,655) (9,271)          (106,765) (4,192) (5,490) (2,137) (777) (1,535)       (3,415) (3,955)       (556) (1,581)    (50,728) (716,488) (508,182)          (85,811) (713,589) (421,671) 31,302 4,864 64,195 (3,497) (3,286) (96,118)          7,278 (4,477) (54,588) (98,528) (157,369)       (96,452) (158,565) 4,253 4,253 (4,192) (5,490)       (2,137) 2,433
Transfers in Level 3       58,905                   53,068                         5,837                                     273 273          273 273                      (576,272)    (1,494,714)                   (576,272)    (1,553,619)       58,905                   273 (220,649)                (220,922) 273 273            
Transfers out of Level 3       (6,301)                            (464)                (5,837)                                                                                  1,598,492 650,758                      1,598,492 657,059       (6,301)                      365,046                365,046                  
Deconsolidation of VIEs                                                                                                                                                                                    
Balance, end of period 60,722 69,412 60,722 (474,041) (415,360) (305,674) (474,041) 50,295 61,782 50,295          6,832 3,949 6,832 3,595 3,681 3,595 (286,920) (137,947) (103,021) (286,920) (187,121) (277,413) (202,653) (187,121)             71,071 71,071 (305,674) 67,365 67,365 273 273       3,433 3,433 (103,021) (202,653)    13,753,133 15,170,359 13,753,133 2,160,113 2,500,565 2,160,113 14,984,659 14,752,053 14,984,659 (2,993,341) (1,750,372) (2,993,341) 60,722 69,412 60,722 15,021 14,061 15,021 (474,041) (415,360) (474,041) 15,341,277 15,341,277 2,423,914 2,423,914 14,762,446 14,762,446 (1,624,151) (1,624,151) 71,071 71,071 13,671 13,671 (305,674) (305,674)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date          $ 22,792 $ (92,002) $ 65,509 $ (51,611)                                     $ (1,156) $ (28,162) $ 24,838 $ (47,419) $ 23,948 $ (63,840) $ 40,671 $ (4,192)                   $ 32,984                         $ 5,931 $ 27,053    $ 363,599 $ 1,053,758 $ 409,121 $ (64,826) $ 328,768 $ (127,539) $ 439,649 $ 956,402 $ 738,602 $ (33,245) $ (138,914) $ (148,573)          $ (771) $ (496) $ (1,758) $ 22,792 $ (92,002) $ (51,611) $ 286,586 $ (472,358) $ 36,694 $ (172,304) $ 195,305 $ (391,336) $ 21,816 $ 26,163       $ (213) $ (390) $ 32,984 $ 65,509