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Basis of Presentation and Significant Accounting Policies - Summary of Activity in Goodwill for Financial Guarantee Reporting Unit (Detail) (USD $) In Thousands, unless otherwise specified		8 Months Ended	4 Months Ended	12 Months Ended
	Apr. 30, 2013	Dec. 31, 2013 Successor Ambac [Member]	Apr. 30, 2013 Predecessor Ambac [Member]	Dec. 31, 2012 Predecessor Ambac [Member]
Goodwill [Line Items]
Beginning balance	$ 514,511	$ 514,511
Goodwill recorded in connection with emergence from Chapter 11		514,511
Accumulated impairment loss
Ending balance	$ 514,511	$ 514,511

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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