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Basis of Presentation and Significant Accounting Policies - Summary of Liabilities Subject to Compromise (Detail) (Predecessor Ambac [Member], USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Dec. 31, 2012
Predecessor Ambac [Member]
    
Reorganization Items [Line Items]    
Debt obligations and accrued interest payable   $ 1,690,312
Other   14,592
Consolidated liabilities subject to compromise $ 1,704,641 $ 1,704,904