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Investments - Summary of Net Investment Income (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Successor Ambac [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Investment [Line Items]        
Fixed income securities   $ 147,014 $ 118,097 $ 386,385
Short-term investments   1,528 677 1,405
Loans   306 146 714
Investment expense   (5,982) (2,549) (5,602)
Securities available-for-sale and short-term   142,866 116,371 382,902
Other investments 0 3,580 369  
Total net investment income   $ 146,446 $ 116,740 $ 382,902