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Segment Information - Schedule of Gross Premiums Written, Net Premiums Earned and Net Change in Fair Value of Credit Derivatives (Detail) (USD $)
In Thousands, unless otherwise specified
 8 Months Ended 4 Months Ended 12 Months Ended 4 Months Ended 12 Months Ended 4 Months Ended 12 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2013
Successor Ambac [Member]
Dec. 31, 2013
Successor Ambac [Member]
Reportable Geographical Components [Member]
United States [Member]
Dec. 31, 2013
Successor Ambac [Member]
Reportable Geographical Components [Member]
United Kingdom [Member]
Dec. 31, 2013
Successor Ambac [Member]
Reportable Geographical Components [Member]
Other International [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Reportable Geographical Components [Member]
United States [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Reportable Geographical Components [Member]
United States [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Reportable Geographical Components [Member]
United Kingdom [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Reportable Geographical Components [Member]
United Kingdom [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Reportable Geographical Components [Member]
Other International [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Reportable Geographical Components [Member]
Other International [Member]
Segment Reporting Information [Line Items]                        
Gross Premiums Written $ (80,309) $ (61,255) $ (7,368) $ (11,686) $ (14,125) $ (277,508) $ (16,102) $ (260,517) $ 10,673 $ 10,785 $ (8,696) $ (27,776)
Net premiums earned 213,518 165,099 35,387 13,032 130,000 414,604 104,594 315,367 18,071 73,955 7,335 25,282
Net Change In Fair Value Of Credit Derivatives $ 192,869 $ 122,696 $ 22,548 $ 47,625 $ (60,384) $ (9,219) $ (31,134) $ (8,496) $ (5,861) $ (5,709) $ (23,389) $ 4,986