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Derivative Instruments - Summary of Net Par Outstanding for CDS Contracts (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Ambac Rating |  |
Notional outstanding | $ 10,204,738 | $ 11,281,777
AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 756,171 | 678,483
AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 5,407,829 | 5,955,118
A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 3,083,124 | 3,684,193
BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 665,792 | 672,293
Below investment grade rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 291,822 | 291,690
CLO [Member] |  |
Ambac Rating |  |
Notional outstanding | 5,702,366 | 6,155,767
CLO [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 272,685 | 166,200
CLO [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 4,187,258 | 4,676,362
CLO [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,242,423 | 1,313,205
Other [Member] |  |
Ambac Rating |  |
Notional outstanding | 4,502,372 | 5,126,010
Other [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 483,486 | 512,283
Other [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,220,571 | 1,278,756
Other [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,840,701 | 2,370,988
Other [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 665,792 | 672,293
Other [Member] | Below investment grade rating [Member] |  |
Ambac Rating |  |
Notional outstanding | $ 291,822 | $ 291,690

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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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Balance Type: | debit
Period Type: | instant

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- Details
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