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Fair Value Measurements - Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3 (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended 6 Months Ended 12 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 1 Months Ended 4 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 4 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 4 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Successor Ambac [Member]
European ABS Transactions [Member]
Dec. 31, 2013
Successor Ambac [Member]
European ABS Transactions [Member]
Jun. 30, 2014
Successor Ambac [Member]
US Commercial ABS Transaction [Member]
Dec. 31, 2013
Successor Ambac [Member]
US Commercial ABS Transaction [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Investments [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Investments [Member]
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Investments [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Investments [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Other Assets [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Other Assets [Member]
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Other Assets [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Other Assets [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Derivative Financial Instruments, Liabilities [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Derivative Financial Instruments, Liabilities [Member]
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Derivative Financial Instruments, Liabilities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Investments [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Investments [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Investments [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Investments [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Investments [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Investments [Member]
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Other Assets [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Other Assets [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Other Assets [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Other Assets [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Other Assets [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Other Assets [Member]
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Derivative Financial Instruments, Liabilities [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Derivative Financial Instruments, Liabilities [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Derivative Financial Instruments, Liabilities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Derivative Financial Instruments, Liabilities [Member]
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Derivative Financial Instruments, Liabilities [Member]
Apr. 30, 2013
Loan Origination Commitments [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Apr. 30, 2013
Loan Origination Commitments [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Mar. 31, 2013
Loan Origination Commitments [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Dec. 31, 2012
Loan Origination Commitments [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Jun. 30, 2013
Loan Origination Commitments [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2014
Loan Origination Commitments [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2014
Loan Origination Commitments [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Mar. 31, 2014
Loan Origination Commitments [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Dec. 31, 2013
Loan Origination Commitments [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Apr. 30, 2013
Loan Origination Commitments [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Apr. 30, 2013
Long-term Debt [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Apr. 30, 2013
Long-term Debt [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Mar. 31, 2013
Long-term Debt [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Dec. 31, 2012
Long-term Debt [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Jun. 30, 2013
Long-term Debt [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2014
Long-term Debt [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2014
Long-term Debt [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Mar. 31, 2014
Long-term Debt [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Dec. 31, 2013
Long-term Debt [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Apr. 30, 2013
Long-term Debt [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Apr. 30, 2013
Investment Contracts [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Apr. 30, 2013
Investment Contracts [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Mar. 31, 2013
Investment Contracts [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Dec. 31, 2012
Investment Contracts [Member]
Fair Value, Inputs, Level 3 [Member]
Predecessor [Member]
Jun. 30, 2013
Investment Contracts [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2014
Investment Contracts [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Jun. 30, 2014
Investment Contracts [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Mar. 31, 2014
Investment Contracts [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Dec. 31, 2013
Investment Contracts [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Apr. 30, 2013
Investment Contracts [Member]
Fair Value, Inputs, Level 3 [Member]
Successor Ambac [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                                                                                                                                                    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability         $ 15,170,359 $ 15,170,359 $ 14,364,161 $ 14,416,488 $ 69,412 $ 69,412 $ 57,791 $ 60,402 $ 14,061 $ 14,061 $ 14,230 $ 14,557 $ (415,360) $ (415,360) $ (328,689) $ (322,337) $ 14,231,973 $ 14,917,043 $ 14,917,043 $ 14,409,383 $ 14,253,705 $ 15,170,359 $ 68,572 $ 66,352 $ 66,352 $ 66,923 $ 67,783 $ 69,412 $ 13,884 $ 12,782 $ 12,782 $ 13,122 $ 13,384 $ 14,061 $ (340,663) $ (218,661) $ (218,661) $ (202,482) $ (186,934) $ (415,360) $ 14,752,053 $ 14,752,053 $ 14,116,811 $ 15,359,073 $ 13,820,878 $ 13,743,231 $ 13,743,231 $ 13,269,452 $ 13,398,895 $ 14,752,053 $ (1,750,372) $ (1,750,372) $ (1,910,589) $ (2,956,501) $ (1,573,687) $ (1,375,049) $ (1,375,049) $ (1,284,394) $ (1,514,605) $ (1,750,372) $ 2,500,565 $ 2,500,565 $ 2,414,607 $ 2,261,294 $ 2,242,989 $ 2,688,388 $ 2,688,388 $ 2,546,762 $ 2,475,182 $ 2,500,565
Coupon rate 0.56% 0.72% 5.88% 6.11%                                                                                                                                            
Maturity 20 years 11 months 1 day 17 years 9 months 40 days 15 years 11 months 15 days 6 years 9 months 28 days                                                                                                                                            
Yield 9.31% 8.02% 7.26% 11.95%                                                                                                                                            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Additions Of Consolidated Vies         (409,300) (409,300)                                                                                                                        (409,300) (409,300)                                            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings         (490,336) (1,057,181)     10 33     169 496     85,384 88,546     720,947 (192,134) (364,672)       (395) (422) (841)       177 340 602       (70,127) 25,959 40,208       (555,946) (956,402)     586,641 (204,722) (526,569)       11,521 138,914     (4,347) 61,028 251,990       (31,474) (328,768)     208,998 (74,317) (130,062)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss         (128,819) 776,014     (11,631) (12,329)                         302,722 (365,973) (452,772)       (63) 124 341                                     (105,622) 849,833     282,421 (328,415) (408,217)       42,918 (150,987)     (28,214) 29,627 38,248       (54,484) 89,497     48,578 (67,309) (83,144)      
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases                                                       (70,000)                                                                    (70,000)                                                        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues                                                                                                                                                                                       
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales                                                                                                                                                                                       
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements         (27,613) (716,488)     0 (3,286)               (1,287) (4,477)     (58,841) (50,447) (223,898)       (1,298) (869) (1,723)                      4,570 9,780 8,481       (26,326) (713,589)     (62,113) (59,358) (660,450)       0 4,864     0 0 429,794                               
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three         0 0                                   (220,922) 0 0          0 0                                                              0 0     (220,922)                                     
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three         623,956 1,598,492                                   365,046    (208)             (208)                                                              623,956 1,598,492     365,046                                     
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held         $ 489,410 $ 1,053,758               $ (169) $ (496)     $ (86,320) $ (92,002)     $ (758,944) $ 190,387 $ 359,729                      $ (177) $ (340) $ (602)       $ 32,525 $ (27,284) $ (42,315)       $ 555,946 $ 956,402     $ (586,641) $ 204,722 $ 521,436       $ (11,521) $ (138,914)     $ 4,347 $ (61,028) $ (248,852)       $ 31,474 $ 328,768     $ (208,998) $ 74,317 $ 130,062