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Investments - Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged (Detail) (Successor Ambac [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Cash and Securities Pledged Directly from Investment Portfolio [Member]
Investment [Line Items]
Fair Value of Cash and Underlying Securities	$ 330,681	$ 500,986
Fair Value of Cash and Securities Pledged to Investment and Repurchase Agreement Counterparties	158,040	371,723
Fair Value of Cash and Securities Pledged to Derivative Counterparties	172,641	129,263
Cash and Securities Pledged from Its Derivative Counterparties [Member]
Investment [Line Items]
Fair Value of Cash and Underlying Securities		690
Fair Value of Cash and Securities Pledged to Investment and Repurchase Agreement Counterparties
Fair Value of Cash and Securities Pledged to Derivative Counterparties