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Employment Benefit Plans - Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 8 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2013
Successor Ambac [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding at beginning of period, Shares    602,775 1,139,429
Shares, Granted 66,668      
Shares, Exercised         
Shares, Forfeited or expired    (602,775) (536,654)
Outstanding at end of period, Shares 66,668    602,775
Shares, Exercisable       602,775
Weighted Average Exercise Price, Beginning Balance    $ 41.17 $ 45.15
Weighted Average Exercise Price, Granted $ 20.63      
Weighted Average Exercise Price, Exercised         
Weighted Average Exercise Price, Forfeited or expired    $ 41.17 $ 49.63
Weighted Average Exercise Price, Ending Balance $ 20.63    $ 41.17
Weighted Average Exercise Price, Exercisable       $ 41.17
Weighted Average Remaining Contractual Life, Granted 6 years 11 months 23 days    
Aggregate Intrinsic Value, Granted 262,000    
Weighted Average Remaining Contractual Life, Ending Balance 6 years 11 months 23 days 0 years 1 year 5 months 16 days
Aggregate Intrinsic Value, Ending Balance $ 262      
Weighted Average Remaining Contractual Life, Exercisable 0 years 0 years 1 year 5 months 16 days
Aggregate Intrinsic Value, Exercisable