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Financial Guarantee Insurance Contracts - Summary of Gross Premium Receivable Roll-Forward (Direct and Assumed Contracts) (Detail) - Successor [Member] - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Insurance [Line Items]
Percentage Premiums Receivable Related To Transactions With Non Investment Grade Internal Ratings	28.00%		32.00%
Financial Guarantee Insurance Contracts, Premium Receivable [Roll Forward]
Beginning premium receivable	$ 1,000,607	$ 1,453,021	$ 1,453,021
Premium receipts	(70,940)	(100,646)
Adjustments for changes in expected and contractual cash flows	(39,613)	(93,795)
Accretion of premium receivable discount	18,795	29,644
Uncollectable premiums	1,978	(801)
Other adjustments (including foreign exchange)	(15,381)	(20,791)
Ending premium receivable	$ 895,446	$ 1,266,632	$ 1,000,607
Percentage Of Premiums Receivable Related To Non Investment Grade Rmbs Transactions	7.00%		7.00%
Premiums Receivable, Allowance for Doubtful Accounts	$ 15,802		$ 17,780
Premiums Past Due On Non Investment Grade Obligation	$ 500

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- Definition

Insurance [Line Items]

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Percentage of financial guarantee premiums receivable related to RMBS insured transactions with non-investment grade internal ratings.

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Percentage of financial guarantee premiums receivable related to insured transactions with non-investment grade internal ratings.

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Past due premiums on policies insuring internally rated non-investment grade obligations.

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Amount of increase (decrease) in the allowance for doubtful accounts.

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- Definition

Amount of the premium receivable for financial guarantee insurance contracts reported in the statement of financial position. This element primarily would consist of those financial guarantee insurance contracts which premiums are to be collected over the contract period, but may, on occasion, include premiums which are to be collected in full at inception, but which straddle a financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 310



-Section 50



-Paragraph 3



-Subparagraph (c)(1),(5)



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Amount of premium payments received during the period for premiums receivable on financial guarantee insurance contracts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 310



-Section 50



-Paragraph 3



-Subparagraph (c)(2)



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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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This element represents the accretion of the discount for premiums receivable on financial guarantee insurance contracts.

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This element represents adjustments to the premium receivable related to financial guarantee insurance contracts due to changes in the period of the contract.

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-Publisher FASB



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This element represents other adjustments to premiums receivable on financial guarantee insurance contracts.

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-Publisher FASB



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The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value.

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