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Financial Guarantees in Force - Summary of Financial Guarantee Portfolio Diversification by Type of Guaranteed Bond (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | $ 223,633,000 | $ 272,504,000
Public Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 143,018,000 | 176,817,000
Public Finance [Member] | Lease and tax-backed revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 50,415,000 | 59,864,000
Public Finance [Member] | General obligation [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 34,623,000 | 42,959,000
Public Finance [Member] | Utility revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 18,651,000 | 22,529,000
Public Finance [Member] | Transportation revenues [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 13,892,000 | 18,945,000
Public Finance [Member] | Higher education [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 10,382,000 | 13,618,000
Public Finance [Member] | Housing revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 8,176,000 | 8,823,000
Public Finance [Member] | Health care revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 5,266,000 | 7,824,000
Public Finance [Member] | Other [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 1,613,000 | 2,255,000
Structured Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 42,359,000 | 55,145,000
Structured Finance [Member] | Mortgage-backed and home equity [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 19,117,000 | 23,164,000
Structured Finance [Member] | Investor-owned utilities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 7,071,000 | 9,049,000
Structured Finance [Member] | Other CDOs [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 5,941,000 | 8,060,000
Structured Finance [Member] | Student loan [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 5,411,000 | 7,824,000
Structured Finance [Member] | Asset-backed Securities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 2,905,000 | 4,732,000
Structured Finance [Member] | Other [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 1,914,000 | 2,316,000
International Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 38,256,000 | 40,542,000
International Finance [Member] | Mortgage-backed and home equity [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 1,268,000 | 1,397,000
International Finance [Member] | Other CDOs [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 3,191,000 | 4,375,000
International Finance [Member] | Asset-backed Securities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 8,702,000 | 9,560,000
International Finance [Member] | Investor-owned and public utilities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 10,314,000 | 10,510,000
International Finance [Member] | Sovereign/sub-sovereign [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 7,289,000 | 7,282,000
International Finance [Member] | Transportation [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 6,002,000 | 5,914,000
International Finance [Member] | Other [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | $ 1,490,000 | $ 1,504,000

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- Definition The amount as of the balance sheet date of the participating business in force. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 50 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6483535&loc=d3e16392-158451 + Details
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