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Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Successor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Deferred tax liabilities:    
Insurance intangible $ 567,564  
Variable interest entities   22,015
Deferred acquisition costs   57,262
Unearned premiums and credit fees 6,165 22,714
Unrealized gains on investments 4,041  
Other 1,907 17,251
Total deferred tax liabilities 579,677 119,242
Deferred tax assets:    
Variable interest entities 59,710  
Unrealized losses & impairments on investments   12,605
Net operating loss and capital carryforward 2,137,334 2,857,926
Loss reserves 833,823 490,677
Compensation 7,876 7,184
Other 3,012 5,687
Sub-total deferred tax assets 3,041,755 3,374,079
Valuation allowance 2,463,642 3,256,423
Total deferred tax assets 578,113 117,656
Net deferred tax liability $ (1,564) $ (1,586)