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Financial Guarantee Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Successor Ambac [Member]
Policies
Apr. 30, 2013
Successor Ambac [Member]
Dec. 31, 2013
Successor Ambac [Member]
I/SL [Member]
Policies
Dec. 31, 2013
Successor Ambac [Member]
IA [Member]
Policies
Dec. 31, 2013
Successor Ambac [Member]
II [Member]
Policies
Dec. 31, 2013
Successor Ambac [Member]
III [Member]
Policies
Dec. 31, 2013
Successor Ambac [Member]
IV [Member]
Policies
Dec. 31, 2013
Successor Ambac [Member]
V [Member]
Policies
Dec. 31, 2012
Predecessor Ambac [Member]
Policies
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2011
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
I/SL [Member]
Policies
Dec. 31, 2012
Predecessor Ambac [Member]
IA [Member]
Policies
Dec. 31, 2012
Predecessor Ambac [Member]
II [Member]
Policies
Dec. 31, 2012
Predecessor Ambac [Member]
III [Member]
Policies
Dec. 31, 2012
Predecessor Ambac [Member]
IV [Member]
Policies
Dec. 31, 2012
Predecessor Ambac [Member]
V [Member]
Policies
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]                                  
Number of policies 339   18 23 52 76 169 1 316     14 12 28 114 147 1
Remaining weighted-average contract period (in years) 14 years   13 years 19 years 17 years 19 years 11 years 6 years 13 years     15 years 21 years 18 years 20 years 8 years 6 years
Gross insured contractual payments outstanding:                                  
Principal $ 22,206,789   $ 834,708 $ 1,125,284 $ 3,464,420 $ 5,597,387 $ 11,184,943 $ 47 $ 24,060,370     $ 311,157 $ 786,998 $ 1,245,793 $ 9,161,747 $ 12,554,628 $ 47
Interest 8,397,133   506,903 871,751 2,130,271 2,331,222 2,556,968 18 9,243,183     166,276 715,129 379,237 4,905,775 3,076,746 20
Total 30,603,922   1,341,611 1,997,035 5,594,691 7,928,609 13,741,911 65 33,303,553     477,433 1,502,127 1,625,030 14,067,522 15,631,374 67
Gross undiscounted claim liability 11,276,259   7,447 54,398 221,321 3,029,891 7,963,137 65 12,120,462     2,135 40,898 49,521 4,051,076 7,976,765 67
Discount, gross claim liability (2,452,448)   (1,225) (6,726) (32,630) (1,299,032) (1,112,829) (6) (2,138,631)     (219) (3,532) (3,247) (1,342,910) (788,720) (3)
Gross claim liability before all subrogation and before reinsurance 8,823,811   6,222 47,672 188,691 1,730,859 6,850,308 59 9,981,831     1,916 37,366 46,274 2,708,166 7,188,045 64
Less:                                  
Gross RMBS subrogation (2,215,849)         (4,516) (2,211,333)   (2,561,163)           (16,170) (2,544,993)  
Discount, RMBS subrogation 9,251         15 9,236   37,938           312 37,626  
Discounted RMBS subrogation, before reinsurance (2,206,598) (2,482,918)       (4,501) (2,202,097)   (2,523,225) (2,482,918) (2,720,266)       (15,858) (2,507,367)  
Less:                                  
Gross other subrogation (846,699)       (20,367) (116,145) (710,187)   (907,729)           (141,012) (766,717)  
Discount, other subrogation 91,313       9,522 36,125 45,666   36,949           21,238 15,711  
Discounted other subrogation, before reinsurance (755,386)       (10,845) (80,020) (664,521)   (870,780)           (119,774) (751,006)  
Gross claim liability, net of all subrogation and discounts, before reinsurance 5,861,827   6,222 47,672 177,846 1,646,338 3,983,690 59 6,587,826     1,916 37,366 46,274 2,572,534 3,929,672 64
Less: Unearned premium reserves (502,984)   (4,060) (22,901) (95,550) (280,245) (100,228)   (603,794)     (1,179) (21,626) (17,120) (450,247) (113,622)  
Plus: Loss adjustment expenses reserves 111,391     11 2,257 1,658 107,465   138,108             138,108  
Claim liability reported on Balance Sheet, before reinsurance 5,470,234   2,162 24,782 84,553 1,367,751 3,990,927 59 6,122,140     737 15,740 29,154 2,122,287 3,954,158 64
Reinsurance recoverable reported on Balance Sheet $ 135,711   $ 146 $ 2,271 $ 2,351 $ 120,871 $ 10,072   $ 159,086       $ 1,078 $ 7,085 $ 128,333 $ 22,590