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Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2013
Successor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Deferred tax liabilities:      
Insurance intangible   $ 559,288  
Variable interest entities   131,137 22,015
Investments   168,653  
Deferred acquisition costs     57,262
Unearned premiums and credit fees   38,826 22,714
Other   2,221 17,251
Total deferred tax liabilities   900,125 119,242
Deferred tax assets:      
Unrealized losses & impairments on investments     12,605
Net operating loss and capital carryforward   2,177,029 2,857,926
Loss reserves   634,692 490,677
Compensation   8,724 7,184
AMT Credits 60,000 4,269  
Other   58,581 5,687
Sub-total deferred tax assets   2,883,295 3,374,079
Valuation allowance   1,985,369 3,256,423
Total deferred tax assets   897,926 117,656
Net deferred tax liability   $ 2,199 $ 1,586