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Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Detail) (USD $)
In Thousands, unless otherwise specified
 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended
Jun. 30, 2013
Successor Ambac [Member]
Investment by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Investment by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Investment by Class [Member]
Jun. 30, 2013
Successor Ambac [Member]
Derivatives by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Derivatives by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Derivatives by Class [Member]
Mar. 31, 2013
Successor Ambac [Member]
Derivatives by Class [Member]
Jun. 30, 2013
Successor Ambac [Member]
Asset-backed Securities [Member]
Investment by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Asset-backed Securities [Member]
Investment by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Asset-backed Securities [Member]
Investment by Class [Member]
Jun. 30, 2013
Successor Ambac [Member]
U.S. Agency Obligations [Member]
Investment by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
U.S. Agency Obligations [Member]
Investment by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
U.S. Agency Obligations [Member]
Investment by Class [Member]
Jun. 30, 2013
Successor Ambac [Member]
Collateralized Debt Obligations [Member]
Investment by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Collateralized Debt Obligations [Member]
Investment by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Collateralized Debt Obligations [Member]
Investment by Class [Member]
Jun. 30, 2013
Successor Ambac [Member]
Corporate Obligations [Member]
Investment by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Corporate Obligations [Member]
Investment by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Corporate Obligations [Member]
Investment by Class [Member]
Jun. 30, 2013
Successor Ambac [Member]
Interest Rate Swaps [Member]
Derivatives by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Interest Rate Swaps [Member]
Derivatives by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Interest Rate Swaps [Member]
Derivatives by Class [Member]
Mar. 31, 2013
Successor Ambac [Member]
Interest Rate Swaps [Member]
Derivatives by Class [Member]
Jun. 30, 2013
Successor Ambac [Member]
Credit Derivatives [Member]
Derivatives by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Credit Derivatives [Member]
Derivatives by Class [Member]
Jun. 30, 2014
Successor Ambac [Member]
Credit Derivatives [Member]
Derivatives by Class [Member]
Mar. 31, 2013
Successor Ambac [Member]
Credit Derivatives [Member]
Derivatives by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Derivatives by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Derivatives by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Asset-backed Securities [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Asset-backed Securities [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor [Member]
U.S. Agency Obligations [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor [Member]
U.S. Agency Obligations [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Collateralized Debt Obligations [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Collateralized Debt Obligations [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Corporate Obligations [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Corporate Obligations [Member]
Investment by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Interest Rate Swaps [Member]
Derivatives by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Interest Rate Swaps [Member]
Derivatives by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Credit Derivatives [Member]
Derivatives by Class [Member]
Apr. 30, 2013
Predecessor [Member]
Credit Derivatives [Member]
Derivatives by Class [Member]
Jun. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Investments Contract [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Investments Contract [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Investments Contract [Member]
Jun. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Loans [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Loans [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Loans [Member]
Jun. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Long-Term Debt [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Long-Term Debt [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Long-Term Debt [Member]
Jun. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Investments [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Investments [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Investments [Member]
Jun. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Other Assets [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Other Assets [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Other Assets [Member]
Jun. 30, 2013
Level 3 [Member]
Successor Ambac [Member]
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2014
Level 3 [Member]
Successor Ambac [Member]
Derivative Financial Instruments, Liabilities [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Investments Contract [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Investments Contract [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Loans [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Loans [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Long-Term Debt [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Long-Term Debt [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Investments [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Investments [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Other Assets [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Other Assets [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Derivative Financial Instruments, Liabilities [Member]
Apr. 30, 2013
Level 3 [Member]
Predecessor [Member]
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                                                                                                                            
Balance, beginning of period $ 69,412 $ 66,923 $ 67,783 $ 415,360   $ 186,934 $ 202,482 $ 61,782 $ 63,367 $ 64,073       $ 208 $ 3,949    $ 0 $ 3,681 $ 3,556 $ 3,502 $ 137,947   $ 92,612 $ 114,767 $ 277,413   $ 94,322 $ 87,715 $ 57,791 $ 60,402 $ 328,689 $ 322,337 $ 50,234 $ 50,264       $ 3,905 $ 6,482 $ 3,652 $ 3,656 $ 125,382 $ 108,752 $ 203,307 $ 213,585 $ 15,170,359 $ 14,409,383 $ 14,253,705 $ 2,500,565 $ 2,546,762 $ 2,475,182 $ 14,752,053 $ 13,269,452 $ 13,398,895 $ (1,750,372) $ (1,284,394) $ (1,514,605) $ 69,412 $ 66,923 $ 67,783 $ 14,061 $ 13,122 $ 13,384 $ (415,360) $ (202,482) $ (186,934) $ 14,364,161 $ 14,416,488 $ 2,414,607 $ 2,261,294 $ 14,116,811 $ 15,359,073 $ (1,910,589) $ (2,956,501) $ 57,791 $ 60,402 $ 14,230 $ 14,557 $ (328,689) $ (322,337)
Additions of VIEs consolidated       0    0                           0    0   0    0       0 0                 0 0 0 0                                                                (409,300) (409,300)             (409,300) (409,300)                  
Included in earnings 395 422 841 (70,127) 25,959 40,208   392 446 889          18    0 (15) (24) (48) (18,907) 24,740 46,371   (51,220) 1,219 (6,163)   (10)   85,384 88,546           (3)   (7)   12,213 28,162 73,171 60,384 (720,947) 192,134 364,672 (208,998) 74,317 130,062 (586,641) 204,722 526,569 4,347 (61,028) (251,990) 395 422 841 (177) (340) (602) 70,127 (25,959) (40,208) 490,336 1,057,181 31,474 328,768 555,946 956,402 (11,521) (138,914) (10) (33) (169) (496) (85,384) (88,546)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 63 (124) (341) 0    0   319 (343) (638)          (11)    0 (245) 219 297 0    0   0    0   11,631 (33) 0 0 11,548 0       47 (6) 36 (27) 0 0 0 0 (302,722) 365,973 452,772 (48,578) 67,309 83,144 (282,421) 328,415 408,217 28,214 (29,627) (38,248) 63 (124) (341)                   128,819 (776,014) 54,484 (89,497) 105,622 (849,833) (42,918) 150,987 11,631 12,329            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases          0    0                                       0    0   0    0      12,329 0 0    12,117          160    52 0 0 0 0       70,000                70,000                                                                              
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues          0    0                                       0    0   0    0         0 0                         0 0 0 0                                                                                                         
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales          0    0                                       0    0   0    0         0 0                         0 0 0 0                                                                                                         
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (1,298) (869) (1,723) 4,570 9,780 8,481   (757) (869) (1,723)          (541)    0          10,644 10,497 9,973   (6,074) (717) (1,492)   0 0 (1,287) (4,477) 0 0       0 0       (352) (1,033) (935) (3,444) (58,841) (50,447) (223,898)          (62,113) (59,358) (660,450) 0 0 429,794 (1,298) (869) (1,723)          4,570 9,780 8,481 (27,613) (716,488)       (26,326) (713,589) 0 4,864 0 (3,286)       (1,287) (4,477)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three          0    0                                       0    0   0    0      (3,286) 0 0    (599)          (2,687)       0 0 0 0 (220,922) 0 0                   (220,922)          0 0                   0 0             0 0                  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three       (208) 0    0                  (208)                   0    0   0    0         0 0                         0 0 0 0 365,046    (208)                   365,046             (208)                   623,956 1,598,492             623,956 1,598,492                  
Deconsolidation of VIEs       0    0                           0    0   0    0       0 0                 0 0 0 0                                                                      
Balance, end of period 68,572 66,352 66,352 340,663 218,661 218,661 202,482 61,736 62,601 62,601 0       3,415       3,421 3,751 3,751 108,396 129,010 129,010 114,767 232,267 89,651 89,651 87,715 69,412 69,412 415,360 415,360 61,782 61,782 0 0 3,949 3,949 3,681 3,681 137,947 137,947 277,413 277,413 14,231,973 14,917,043 14,917,043 2,242,989 2,688,388 2,688,388 13,820,878 13,743,231 13,743,231 (1,573,687) (1,375,049) (1,375,049) 68,572 66,352 66,352 13,884 12,782 12,782 (340,663) (218,661) (218,661) 15,170,359 15,170,359 2,500,565 2,500,565 14,752,053 14,752,053 (1,750,372) (1,750,372) 69,412 69,412 14,061 14,061 (415,360) (415,360)
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          $ (32,525) $ 27,284 $ 42,315                                       $ (18,907) $ 24,740 $ 46,371   $ (13,618) $ 2,544 $ (4,056)         $ 86,320 $ 92,002                         $ 12,213 $ 28,162 $ 74,107 $ 63,840 $ 758,944 $ (190,387) $ (359,729) $ 208,998 $ (74,317) $ (130,062) $ 586,641 $ (204,722) $ (521,436) $ (4,347) $ 61,028 $ 248,852          $ 177 $ 340 $ 602 $ (32,525) $ 27,284 $ 42,315 $ (489,410) $ (1,053,758) $ (31,474) $ (328,768) $ (555,946) $ (956,402) $ 11,521 $ 138,914       $ 169 $ 496 $ 86,320 $ 92,002