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Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 2 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 2 Months Ended
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Apr. 30, 2013 Predecessor Ambac [Member] Investment by class [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Investment by class [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Investment by class [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Investment by class [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Investment by class [Member] Other Asset Backed Securities [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Investment by class [Member] Other Asset Backed Securities [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Investment by class [Member] Other Asset Backed Securities [Member] | Jun. 30, 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] | Jun. 30, 2012 Predecessor Ambac [Member] Investment by class [Member] U.S. Agency Obligations [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Investment by class [Member] U.S. Agency Obligations [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Investment by class [Member] U.S. Agency Obligations [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Investment by class [Member] Collateralized Debt Obligations [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Investment by class [Member] Collateralized Debt Obligations [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Investment by class [Member] Collateralized Debt Obligations [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Investment by class [Member] Collateralized Debt Obligations [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Investment by class [Member] Corporate Obligations [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Investment by class [Member] Corporate Obligations [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Investment by class [Member] Corporate Obligations [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Investment by class [Member] Corporate Obligations [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Derivatives by class [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Derivatives by class [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Derivatives by class [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Derivatives by class [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Derivatives by class [Member] Interest Rate Swaps [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Derivatives by class [Member] Interest Rate Swaps [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Derivatives by class [Member] Interest Rate Swaps [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Derivatives by class [Member] Interest Rate Swaps [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Derivatives by class [Member] Credit Derivatives [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Derivatives by class [Member] Credit Derivatives [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Derivatives by class [Member] Credit Derivatives [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Derivatives by class [Member] Credit Derivatives [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Derivatives by class [Member] Call options on long-term debt [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Derivatives by class [Member] Call options on long-term debt [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Derivatives by class [Member] Call options on long-term debt [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Derivatives by class [Member] Call options on long-term debt [Member] | Jun. 30, 2013 Successor Ambac [Member] Investment by class [Member] | Jun. 30, 2013 Successor Ambac [Member] Investment by class [Member] Other Asset Backed Securities [Member] | Jun. 30, 2013 Successor Ambac [Member] Investment by class [Member] U.S. Agency Obligations [Member] | Jun. 30, 2013 Successor Ambac [Member] Investment by class [Member] Collateralized Debt Obligations [Member] | Jun. 30, 2013 Successor Ambac [Member] Investment by class [Member] Corporate Obligations [Member] | Jun. 30, 2013 Successor Ambac [Member] Derivatives by class [Member] | Jun. 30, 2013 Successor Ambac [Member] Derivatives by class [Member] Interest Rate Swaps [Member] | Jun. 30, 2013 Successor Ambac [Member] Derivatives by class [Member] Credit Derivatives [Member] | Jun. 30, 2013 Successor Ambac [Member] Derivatives by class [Member] Call options on long-term debt [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] Investments contract [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] Investments contract [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] Investments contract [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] Investments contract [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] Loans [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] Loans [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] Loans [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] Loans [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] Long-term debt [Member] | Jun. 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] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] Long-term debt [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] Investments [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] Investments [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] Investments [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] Investments [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] Other Assets [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] Other Assets [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] Other Assets [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] Other Assets [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] Derivatives assets [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] Derivatives assets [Member] | Apr. 30, 2013 Level 3 [Member] Predecessor Ambac [Member] Derivatives assets [Member] | Jun. 30, 2012 Level 3 [Member] Predecessor Ambac [Member] Derivatives assets [Member] | Jun. 30, 2013 Level 3 [Member] Successor Ambac [Member] | Jun. 30, 2013 Level 3 [Member] Successor Ambac [Member] Investments contract [Member] | Jun. 30, 2013 Level 3 [Member] Successor Ambac [Member] Loans [Member] | Jun. 30, 2013 Level 3 [Member] Successor Ambac [Member] Long-term debt [Member] | Jun. 30, 2013 Level 3 [Member] Successor Ambac [Member] Investments [Member] | Jun. 30, 2013 Level 3 [Member] Successor Ambac [Member] Other Assets [Member] | Jun. 30, 2013 Level 3 [Member] Successor Ambac [Member] Derivatives assets [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ 57,791 | $ 161,450 | $ 60,402 | $ 97,522 | $ 50,234 | $ 137,026 | $ 50,264 | $ 75,886 |  | $ 1,218 |  | $ 1,224 | $ 3,905 | $ 9,839 | $ 6,482 | $ 12,482 | $ 3,652 | $ 13,367 | $ 3,656 | $ 7,930 | $ (328,689) | $ (355,616) | $ (322,337) | $ (486,775) | $ (125,382) | $ (222,222) | $ (108,752) | $ (302,177) | $ (203,307) | $ (201,129) | $ (213,585) | $ (190,653) |  | $ 67,735 |  | $ 6,055 | $ 69,412 | $ 61,782 |  | $ 3,949 | $ 3,681 | $ (415,360) | $ (137,947) | $ (277,413) |  | $ 14,364,161 | $ 13,679,955 | $ 14,416,488 | $ 14,019,216 | $ 2,414,607 | $ 2,184,665 | $ 2,261,294 | $ 2,199,338 | $ 14,116,811 | $ 14,460,077 | $ 15,359,073 | $ 14,126,994 | $ (1,910,589) | $ (2,786,644) | $ (2,956,501) | $ (1,934,642) | $ 57,791 | $ 161,450 | $ 60,402 | $ 97,522 | $ 14,230 | $ 16,023 | $ 14,557 | $ 16,779 | $ (328,689) | $ (355,616) | $ (322,337) | $ (486,775) | $ 15,170,359 | $ 2,500,565 | $ 14,752,053 | $ (1,750,372) | $ 69,412 | $ 14,061 | $ (415,360)
Additions of VIEs consolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (409,300) |  | (409,300) |  |  |  |  |  |  |  |  |  | (409,300) |  | (409,300) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in earnings | (10) | 88 | (33) | 40 |  |  |  |  |  | (2) |  | (2) | (3) |  | (6) | (2) | (7) | 90 | (27) | 44 | (85,384) | (81,290) | (88,546) | 41,037 | (12,213) | (112,904) | (28,162) | (45,035) | (73,171) | (7,416) | (60,384) | (14,638) |  | 39,030 |  | 100,710 | 395 | 392 |  | 18 | (15) | 70,127 | 18,907 | 51,220 |  | 490,336 | 91,712 | 1,057,181 | 160,521 | 31,474 | 20,103 | 328,768 | (62,713) | 555,946 | 131,807 | 956,402 | 298,472 | (11,521) | 21,235 | (138,914) | (115,328) | (10) | 88 | (33) | 40 | (169) | (231) | (496) | (987) | (85,384) | (81,290) | (88,546) | 41,037 | (720,947) | (208,998) | (586,641) | 4,347 | 395 | (177) | 70,127
Included in other comprehensive income | 11,631 | (1,588) | 12,329 | 6,225 | 11,548 | (1,696) | 12,117 | 6,376 |  | (3) |  | (9) | 47 | 190 | 160 | 291 | 36 | (79) | 52 | (433) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63 | 319 |  | (11) | (245) |  |  |  |  | 128,819 | (256,974) | (776,014) | 171,634 | 54,484 | (42,706) | (89,497) | 25,437 | 105,622 | (267,190) | (849,833) | 148,667 | (42,918) | 54,510 | 150,987 | (8,695) | 11,631 | (1,588) | 12,329 | 6,225 |  |  |  |  |  |  |  |  | (302,722) | (48,578) | (282,421) | 28,214 | 63 |  |
Purchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements |  | (89,879) | (3,286) | (92,621) |  | (84,584) | (599) | (84,584) |  | (749) |  | (749) |  | (471) | (2,687) | (3,213) |  | (4,075) |  | (4,075) | (1,287) | (70,698) | (4,477) | (61,866) | (352) | 39,139 | (1,033) | 51,225 | (935) | (3,072) | (3,444) | (6,326) |  | (106,765) |  | (106,765) | (1,298) | (757) |  | (541) |  | 4,570 | 10,644 | (6,074) |  | (27,613) | (227,135) | (716,488) | (457,454) |  |  |  |  | (26,326) | (86,421) | (713,589) | (335,860) |  | 19,863 | 4,864 | 32,893 |  | (89,879) | (3,286) | (92,621) |  |  |  |  | (1,287) | (70,698) | (4,477) | (61,866) | (58,841) |  | (62,113) |  | (1,298) |  | 4,570
Transfers in Level 3 |  |  |  | 58,905 |  |  |  | 53,068 |  |  |  |  |  |  |  |  |  |  |  | 5,837 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (312,083) |  | (918,442) |  |  |  |  |  |  |  |  |  | (312,083) |  | (977,347) |  |  |  | 58,905 |  |  |  |  |  |  |  |  | (220,922) |  |  | (220,922) |  |  |
Transfers out of Level 3 |  | (6,301) |  | (6,301) |  |  |  |  |  | (464) |  | (464) |  |  |  |  |  | (5,837) |  | (5,837) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 623,956 | 650,758 | 1,598,492 | 650,758 |  |  |  |  |  |  |  |  | 623,956 | 657,059 | 1,598,492 | 657,059 |  | (6,301) |  | (6,301) |  |  |  |  |  |  |  |  | 365,046 |  |  | 365,046 |  |  |
Deconsolidation of VIEs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, end of period | 69,412 | 63,770 | 69,412 | 63,770 | 61,782 | 50,746 | 61,782 | 50,746 |  |  |  |  | 3,949 | 9,558 | 3,949 | 9,558 | 3,681 | 3,466 | 3,681 | 3,466 | (415,360) | (507,604) | (415,360) | (507,604) | (137,947) | (295,987) | (137,947) | (295,987) | (277,413) | (211,617) | (277,413) | (211,617) |  |  |  |  | 68,572 | 61,736 |  | 3,415 | 3,421 | (340,663) | (108,396) | (232,267) |  | 15,170,359 | 13,626,233 | 15,170,359 | 13,626,233 | 2,500,565 | 2,162,062 | 2,500,565 | 2,162,062 | 14,752,053 | 14,238,273 | 14,752,053 | 14,238,273 | (1,750,372) | (2,346,060) | (1,750,372) | (2,346,060) | 69,412 | 63,770 | 69,412 | 63,770 | 14,061 | 15,792 | 14,061 | 15,792 | (415,360) | (507,604) | (415,360) | (507,604) | 14,231,973 | 2,242,989 | 13,820,878 | (1,573,687) | 68,572 | 13,884 | (340,663)
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (86,320) | $ (118,474) | $ (92,002) | $ (72,910) | $ (12,213) | $ (107,861) | $ (28,162) | $ (46,263) | $ (74,107) | $ (10,613) | $ (63,840) | $ (26,647) |  |  |  |  |  |  |  |  |  | $ 32,525 | $ 18,907 | $ 13,618 |  | $ 489,410 | $ 54,440 | $ 1,053,758 | $ 47,015 | $ 31,474 | $ 20,103 | $ 328,768 | $ (62,713) | $ 555,946 | $ 131,807 | $ 956,402 | $ 298,953 | $ (11,521) | $ 21,235 | $ (138,914) | $ (115,328) |  |  |  |  | $ (169) | $ (231) | $ (496) | $ (987) | $ (86,320) | $ (118,474) | $ (92,002) | $ (72,910) | $ (758,944) | $ (208,998) | $ (586,641) | $ 4,347 |  | $ (177) | $ 32,525

X
- 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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- Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset or liability. + References No definition available. + Details
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- Definition Fair value of financial instruments measured on a recurring basis using unobservable inputs added as a result of new consolidated variable interest entities. + 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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- Definition Amount of gain or loss included in earnings arising from financial instruments measured on a recurring basis using unobservable inputs. + References No definition available. + Details
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- Definition Amount of gain or loss included in other comprehensive income arising from financial instruments measured on a recurring basis using unobservable inputs. + References No definition available. + Details
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- Definition Amount of issuances related to financial instruments measured on a recurring basis using unobservable inputs. + References No definition available. + Details
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- Definition Amount of purchases of financial instruments measured on a recurring basis using unobservable inputs. + References No definition available. + Details
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- Definition Amount of sales of financial instruments measured on a recurring basis using unobservable inputs. + References No definition available. + Details
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- Definition Amount of change in fair value of financial instruments measured on a recurring basis using unobservable inputs arising from transfers into level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Amount of change in fair value of financial instruments measured on a recurring basis using unobservable inputs arising from transfers out of level 3 of the fair value hierarchy. + References No definition available. + Details
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