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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) (USD $)
In Thousands, unless otherwise specified
2 Months Ended 1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Jun. 30, 2013
Successor Ambac [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]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]          
Reinsurance on premiums written, Direct $ (34,081) $ (10,595) $ (27,873) $ (14,125) $ (120,467)
Reinsurance on premiums written, Assumed               
Reinsurance on premiums written, Ceded (3,038) (84) 881 (1,098) (15,973)
Reinsurance on premiums written, Net (31,043) (10,511) (28,754) (13,027) (104,494)
Reinsurance on premiums earned, Direct 62,033 31,388 108,645 138,468 205,792
Reinsurance on premiums earned, Assumed 16 8 68 32 93
Reinsurance on premiums earned, Ceded 4,010 1,652 5,671 8,500 7,893
Reinsurance on premiums earned, Net $ 58,039 $ 29,744 $ 103,042 $ 130,000 $ 197,992