Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-URI http://asc.fasb.org/extlink&oid=6510752

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+ Details

- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-URI http://asc.fasb.org/extlink&oid=6528421

+ Details

Net Income Per Share - Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share (Detail)	2 Months Ended		1 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
	Jun. 30, 2013 Successor Ambac [Member]	Jun. 30, 2013 Successor Ambac [Member] Warrants [Member]	Apr. 30, 2013 Predecessor Ambac [Member]	Jun. 30, 2012 Predecessor Ambac [Member]	Apr. 30, 2013 Predecessor Ambac [Member]	Jun. 30, 2012 Predecessor Ambac [Member]	Apr. 30, 2013 Predecessor Ambac [Member] Restricted Stock Units [Member]	Jun. 30, 2012 Predecessor Ambac [Member] Restricted Stock Units [Member]	Apr. 30, 2013 Predecessor Ambac [Member] Restricted Stock Units [Member]	Jun. 30, 2012 Predecessor Ambac [Member] Restricted Stock Units [Member]	Apr. 30, 2013 Predecessor Ambac [Member] Stock Options [Member]	Jun. 30, 2012 Predecessor Ambac [Member] Stock Options [Member]	Apr. 30, 2013 Predecessor Ambac [Member] Stock Options [Member]	Jun. 30, 2012 Predecessor Ambac [Member] Stock Options [Member]	Apr. 30, 2013 Predecessor Ambac [Member] Warrants [Member]	Jun. 30, 2012 Predecessor Ambac [Member] Warrants [Member]	Apr. 30, 2013 Predecessor Ambac [Member] Warrants [Member]	Jun. 30, 2012 Predecessor Ambac [Member] Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of common shares used for basic earnings per share	45,000,653		302,469,626	302,469,196	302,469,544	302,467,762
Effect of potential dilutive shares:
Effect of potential dilutive shares		1,575,064					109,593		109,701
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share	46,575,717		302,579,219	302,469,196	302,579,245	302,467,762
Anti-dilutive shares excluded from the above reconciliation:
Anti-dilutive shares excluded from reconciliation								71,296		72,060	461,150	850,308	475,550	868,990