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Investments - Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Successor Ambac [Member]
Cash and Securities Pledged Directly from Investment Portfolio [Member]
Dec. 31, 2013
Successor Ambac [Member]
Cash and Securities Pledged from Its Derivative Counterparties [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Cash and Securities Pledged Directly from Investment Portfolio [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Cash and Securities Pledged from Its Derivative Counterparties [Member]
Investment [Line Items]        
Fair Value of Cash and Underlying Securities $ 497,949 $ 690 $ 646,663   
Fair Value of Cash and Securities Pledged to Investment and Repurchase Agreement Counterparties 371,723    375,412   
Fair Value of Cash and Securities Pledged to Derivative Counterparties $ 126,223    $ 271,251