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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, 2013 | Dec. 31, 2012
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Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | $ 179,092,000 | $ 223,633,000
Successor Ambac [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 179,092,000 |
Successor Ambac [Member] | Public Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 116,062,000 |
Successor Ambac [Member] | Public Finance [Member] | Lease and Tax-backed Revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 41,858,000 |
Successor Ambac [Member] | Public Finance [Member] | General Obligation [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 29,115,000 |
Successor Ambac [Member] | Public Finance [Member] | Utility Revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 14,933,000 |
Successor Ambac [Member] | Public Finance [Member] | Transportation Revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 9,653,000 |
Successor Ambac [Member] | Public Finance [Member] | Higher Education [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 7,810,000 |
Successor Ambac [Member] | Public Finance [Member] | Housing Revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 7,439,000 |
Successor Ambac [Member] | Public Finance [Member] | Health Care Revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 3,903,000 |
Successor Ambac [Member] | Public Finance [Member] | Other [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 1,351,000 |
Successor Ambac [Member] | Structured Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 31,412,000 |
Successor Ambac [Member] | Structured Finance [Member] | Mortgage-backed and Home Equity [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 16,026,000 |
Successor Ambac [Member] | Structured Finance [Member] | Investor-owned Utilities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 5,881,000 |
Successor Ambac [Member] | Structured Finance [Member] | Student Loan [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 4,357,000 |
Successor Ambac [Member] | Structured Finance [Member] | Asset-backed Securities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 2,361,000 |
Successor Ambac [Member] | Structured Finance [Member] | Collateralized Debt Obligations [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 897,000 |
Successor Ambac [Member] | Structured Finance [Member] | Other [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 1,890,000 |
Successor Ambac [Member] | International Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 31,618,000 |
Successor Ambac [Member] | International Finance [Member] | Mortgage-backed and Home Equity [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 484,000 |
Successor Ambac [Member] | International Finance [Member] | Asset-backed Securities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 6,884,000 |
Successor Ambac [Member] | International Finance [Member] | Collateralized Debt Obligations [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 822,000 |
Successor Ambac [Member] | International Finance [Member] | Investor-owned and Public Utilities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 9,595,000 |
Successor Ambac [Member] | International Finance [Member] | Sovereign/Sub-sovereign [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 7,394,000 |
Successor Ambac [Member] | International Finance [Member] | Transportation [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 5,021,000 |
Successor Ambac [Member] | International Finance [Member] | Other [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding | 1,418,000 |
Predecessor Ambac [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 223,633,000
Predecessor Ambac [Member] | Public Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 143,018,000
Predecessor Ambac [Member] | Public Finance [Member] | Lease and Tax-backed Revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 50,415,000
Predecessor Ambac [Member] | Public Finance [Member] | General Obligation [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 34,623,000
Predecessor Ambac [Member] | Public Finance [Member] | Utility Revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 18,651,000
Predecessor Ambac [Member] | Public Finance [Member] | Transportation Revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 13,892,000
Predecessor Ambac [Member] | Public Finance [Member] | Higher Education [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 10,382,000
Predecessor Ambac [Member] | Public Finance [Member] | Housing Revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 8,176,000
Predecessor Ambac [Member] | Public Finance [Member] | Health Care Revenue [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 5,266,000
Predecessor Ambac [Member] | Public Finance [Member] | Other [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 1,613,000
Predecessor Ambac [Member] | Structured Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 42,359,000
Predecessor Ambac [Member] | Structured Finance [Member] | Mortgage-backed and Home Equity [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 19,117,000
Predecessor Ambac [Member] | Structured Finance [Member] | Investor-owned Utilities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 7,071,000
Predecessor Ambac [Member] | Structured Finance [Member] | Student Loan [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 5,411,000
Predecessor Ambac [Member] | Structured Finance [Member] | Asset-backed Securities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 2,905,000
Predecessor Ambac [Member] | Structured Finance [Member] | Collateralized Debt Obligations [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 5,941,000
Predecessor Ambac [Member] | Structured Finance [Member] | Other [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 1,914,000
Predecessor Ambac [Member] | International Finance [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 38,256,000
Predecessor Ambac [Member] | International Finance [Member] | Mortgage-backed and Home Equity [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 1,268,000
Predecessor Ambac [Member] | International Finance [Member] | Asset-backed Securities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 8,702,000
Predecessor Ambac [Member] | International Finance [Member] | Collateralized Debt Obligations [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 3,191,000
Predecessor Ambac [Member] | International Finance [Member] | Investor-owned and Public Utilities [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 10,314,000
Predecessor Ambac [Member] | International Finance [Member] | Sovereign/Sub-sovereign [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 7,289,000
Predecessor Ambac [Member] | International Finance [Member] | Transportation [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | 6,002,000
Predecessor Ambac [Member] | International Finance [Member] | Other [Member] |  |
Guarantor Obligations [Line Items] |  |
Net Par Amount Outstanding |  | $ 1,490,000

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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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