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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
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

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant