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Derivative Instruments - Summary of Net Par Outstanding for CDS Contracts (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Ambac Rating |  |
Notional outstanding | $ 5,861,060 | $ 11,281,777
Predecessor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 11,281,777
Predecessor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 678,483
Predecessor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 5,955,118
Predecessor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 3,684,193
Predecessor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 672,293
Predecessor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 291,690
Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 5,861,060 |
Successor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 465,858 |
Successor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 2,305,454 |
Successor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,927,429 |
Successor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 882,332 |
Successor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 279,987 |
CLO [Member] | Predecessor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 6,155,767
CLO [Member] | Predecessor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 166,200
CLO [Member] | Predecessor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 4,676,362
CLO [Member] | Predecessor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 1,313,205
CLO [Member] | Predecessor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  |
CLO [Member] | Predecessor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  |
CLO [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,750,217 |
CLO [Member] | Successor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 13,346 |
CLO [Member] | Successor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,568,030 |
CLO [Member] | Successor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 168,841 |
Other [Member] | Predecessor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 5,126,010
Other [Member] | Predecessor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 512,283
Other [Member] | Predecessor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 1,278,756
Other [Member] | Predecessor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 2,370,988
Other [Member] | Predecessor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 672,293
Other [Member] | Predecessor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 291,690
Other [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 4,110,843 |
Other [Member] | Successor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 452,512 |
Other [Member] | Successor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 737,424 |
Other [Member] | Successor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,758,588 |
Other [Member] | Successor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 882,332 |
Other [Member] | Successor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | $ 279,987 |

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- Definition Aggregate notional amount of credit risk derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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- Details
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