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Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Detail) (USD $) In Thousands, unless otherwise specified | 8 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended
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Dec. 31, 2013 Successor Ambac [Member] Derivatives by Class [Member] | Dec. 31, 2013 Successor Ambac [Member] Investment by Class [Member] | Dec. 31, 2013 Successor Ambac [Member] Investment by Class [Member] Other Asset Backed Securities [Member] | Dec. 31, 2013 Successor Ambac [Member] Investment by Class [Member] U.S. Agency Obligations [Member] | Dec. 31, 2013 Successor Ambac [Member] Level 3 [Member] | Dec. 31, 2013 Successor Ambac [Member] Level 3 [Member] Investments Contract [Member] | Dec. 31, 2013 Successor Ambac [Member] Level 3 [Member] Loans [Member] | Dec. 31, 2013 Successor Ambac [Member] Level 3 [Member] Long-Term Debt [Member] | Dec. 31, 2013 Successor Ambac [Member] Level 3 [Member] Investments [Member] | Dec. 31, 2013 Successor Ambac [Member] Level 3 [Member] Other Assets [Member] | Dec. 31, 2013 Successor Ambac [Member] Level 3 [Member] Derivatives Assets [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Derivatives by Class [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Derivatives by Class [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Investment by Class [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Investment by Class [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Investment by Class [Member] Other Asset Backed Securities [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Investment by Class [Member] Other Asset Backed Securities [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Investment by Class [Member] U.S. Agency Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Investment by Class [Member] U.S. Agency Obligations [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Level 3 [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Level 3 [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Level 3 [Member] Investments Contract [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Level 3 [Member] Investments Contract [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Level 3 [Member] Loans [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Level 3 [Member] Loans [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Level 3 [Member] Long-Term Debt [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Level 3 [Member] Long-Term Debt [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Level 3 [Member] Investments [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Level 3 [Member] Investments [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Level 3 [Member] Other Assets [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Level 3 [Member] Other Assets [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Level 3 [Member] Derivatives Assets [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Level 3 [Member] Derivatives Assets [Member] | Dec. 31, 2013 Interest Rate Swaps [Member] Successor Ambac [Member] Derivatives by Class [Member] | Apr. 30, 2013 Interest Rate Swaps [Member] Predecessor Ambac [Member] Derivatives by Class [Member] | Dec. 31, 2012 Interest Rate Swaps [Member] Predecessor Ambac [Member] Derivatives by Class [Member] | Dec. 31, 2013 Credit Derivatives [Member] Successor Ambac [Member] Derivatives by Class [Member] | Apr. 30, 2013 Credit Derivatives [Member] Predecessor Ambac [Member] Derivatives by Class [Member] | Dec. 31, 2012 Credit Derivatives [Member] Predecessor Ambac [Member] Derivatives by Class [Member] | Dec. 31, 2013 Call Options on Long-Term Debt [Member] Successor Ambac [Member] Derivatives by Class [Member] | Apr. 30, 2013 Call Options on Long-Term Debt [Member] Predecessor Ambac [Member] Derivatives by Class [Member] | Dec. 31, 2012 Call Options on Long-Term Debt [Member] Predecessor Ambac [Member] Derivatives by Class [Member] | Dec. 31, 2013 Collateralized Debt Obligations [Member] Successor Ambac [Member] Investment by Class [Member] | Apr. 30, 2013 Collateralized Debt Obligations [Member] Predecessor Ambac [Member] Investment by Class [Member] | Dec. 31, 2012 Collateralized Debt Obligations [Member] Predecessor Ambac [Member] Investment by Class [Member] | Dec. 31, 2013 Corporate Obligations [Member] Successor Ambac [Member] Investment by Class [Member] | Apr. 30, 2013 Corporate Obligations [Member] Predecessor Ambac [Member] Investment by Class [Member] | Dec. 31, 2012 Corporate Obligations [Member] Predecessor Ambac [Member] Investment by Class [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ (415,360) | $ 69,412 | $ 61,782 |  | $ 15,170,359 | $ 2,500,565 | $ 14,752,053 | $ (1,750,372) | $ 69,412 | $ 14,061 | $ (415,360) | $ (322,337) | $ (486,775) | $ 60,402 | $ 97,522 | $ 50,264 | $ 75,886 |  | $ 1,224 | $ 14,416,488 | $ 14,019,216 | $ 2,261,294 | $ 2,199,338 | $ 15,359,073 | $ 14,126,994 | $ (2,956,501) | $ (1,934,642) | $ 60,402 | $ 97,522 | $ 14,557 | $ 16,779 | $ (322,337) | $ (486,775) | $ (137,947) | $ (108,752) | $ (302,177) | $ (277,413) | $ (213,585) | $ (190,653) |  |  | $ 6,055 | $ 3,949 | $ 6,482 | $ 12,482 | $ 3,681 | $ 3,656 | $ 7,930
Additions of VIEs consolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (409,300) |  |  |  |  |  | (409,300) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings | 217,666 | 1,870 | 1,912 | (5) | (417,184) | (178,322) | (455,231) | (2,490) | 1,870 | (677) | 217,666 | (88,546) | 21,076 | (33) | (3) |  |  |  | (2) | 1,057,181 | 721,347 | 328,768 | (41,289) | 956,402 | 952,463 | (138,914) | (208,678) | (33) | (3) | (496) | (2,222) | (88,546) | 21,076 | 24,797 | (28,162) | (70,415) | 192,869 | (60,384) | (9,219) |  |  | 100,710 | 25 | (6) | (5) | (62) | (27) | 4
Included in other comprehensive income |  | 7,184 | 7,315 | 5 | 955,046 | 152,939 | 873,986 | (79,063) | 7,184 |  |  |  |  | 12,329 | 7,485 | 12,117 | 7,051 |  | (9) | (776,014) | 650,373 | (89,497) | 103,245 | (849,833) | 637,954 | 150,987 | (98,311) | 12,329 | 7,485 |  |  |  |  |  |  |  |  |  |  |  |  |  | (19) | 160 | 646 | (117) | 52 | (203)
Purchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (162,460) |  |  |  |  |  | (162,460) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | (4,528) | (4,528) |  | (4,528) |  |  |  | (4,528) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements | 10,760 | (6,428) | (2,408) | (65) | (42,381) |  | (219,909) | 173,196 | (6,428) |  | 10,760 | (4,477) | (48,886) | (3,286) | (97,206) | (599) | (85,741) |  | (749) | (716,488) | (439,649) |  |  | (713,589) | (358,338) | 4,864 | 64,781 | (3,286) | (97,206) |  |  | (4,477) | (48,886) | 20,538 | (1,033) | 71,592 | (9,778) | (3,444) | (13,713) |  |  | (106,765) | (3,955) | (2,687) | (6,641) |  |  | (4,075)
Transfers in Level 3 |  | 273 |  | 273 | (220,649) |  |  | (220,922) | 273 |  |  |  |  |  | 58,905 |  | 53,068 |  |  |  | (1,816,216) |  |  |  |  |  | (1,875,121) |  | 58,905 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,837
Transfers out of Level 3 |  |  |  |  | 365,046 |  |  | 365,046 |  |  |  |  | 192,248 |  | (6,301) |  |  |  | (464) | 1,598,492 | 1,443,877 |  |  |  |  | 1,598,492 | 1,257,930 |  | (6,301) |  |  |  | 192,248 |  |  | 192,248 |  |  |  |  |  |  |  |  |  |  |  | (5,837)
Deconsolidation of VIEs |  |  |  |  | (1,552,004) |  | (1,552,004) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, end of period | (186,934) | 67,783 | 64,073 | 208 | 14,253,705 | 2,475,182 | 13,398,895 | (1,514,605) | 67,783 | 13,384 | (186,934) | (415,360) | (322,337) | 69,412 | 60,402 | 61,782 | 50,264 |  |  | 15,170,359 | 14,416,488 | 2,500,565 | 2,261,294 | 14,752,053 | 15,359,073 | (1,750,372) | (2,956,501) | 69,412 | 60,402 | 14,061 | 14,557 | (415,360) | (322,337) | (92,612) | (137,947) | (108,752) | (94,322) | (277,413) | (213,585) |  |  |  |  | 3,949 | 6,482 | 3,502 | 3,681 | 3,656
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 | $ 91,436 |  |  |  | $ (545,123) | $ (178,322) | $ (475,152) | $ (2,490) |  | $ (677) | $ 91,436 | $ (92,002) | $ (113,836) |  |  |  |  |  |  | $ 1,053,758 | $ 587,983 | $ 328,768 | $ (41,289) | $ 956,402 | $ 952,944 | $ (138,914) | $ (208,678) |  |  | $ (496) | $ (2,222) | $ (92,002) | $ (113,836) | $ 24,797 | $ (28,162) | $ (78,505) | $ 66,639 | $ (63,840) | $ (35,331) |  |  |  |  |  |  |  |  |

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- Definition The amount of gains or losses included in earnings attributable to unrealized gains or losses on financial instruments measured on a recurring basis using unobservable inputs that are still held at the reporting date. + References No definition available. + Details
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- Definition Fair value of financial instruments measured on a recurring basis using unobservable inputs removed as a result of the deconsolidation of variable interest entities. + References No definition available. + Details
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