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Financial Guarantee Insurance Contracts - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Insurance [Line Items]
Accumulated amortization on insurance intangible asset	$ 537,267		$ 537,267		$ 414,454
Successor [Member]
Insurance [Line Items]
Estimated Future Premium Payments Weighted Average Discounted Rate	2.40%		2.40%		2.70%
Reinsurance Payable	$ 43,511		$ 43,511		$ 53,494
Weighted average period of future premiums			9 years 1 month 6 days		9 years 2 months 12 days
Transactions with non-investment grade internal ratings			26.00%		27.00%
Non-investment grade RMBS on total premiums receivable			8.00%		8.00%
Percentage Of Premiums Receivable Related To Non Investment Grade Structured Ins Transactions			6.00%		5.00%
Uncollectable premium receivables	10,976		$ 10,976		$ 15,240
Past due premiums on policies insuring non-investment grade obligations amount			500
Accelerated premium revenue for retired obligations	18,174	$ 28,369	38,231	$ 64,862
Reinsurance recoveries of losses included in losses and loss expenses	4,383	6,907	11,990	30,727
Losses and loss expense reserves ceded to reinsurers	24,298	63,657	24,298	63,657	44,059	$ 100,355
Subrogation recoveries	1,923,256		1,923,256		2,829,575
Subrogation recoveries, net of reinsurance	1,894,680		1,894,680		2,800,149
Intangible amortization expense	44,553	$ 39,680	134,456	$ 115,200
Insurance intangible asset	$ 1,022,865		$ 1,022,865		$ 1,212,112
Percentage of Premiums Receivable Related To Non Investment Grade Lease Securitizations			4.00%		5.00%
Percentage Of Premiums Receivable Related To Non Investment Grade Student Loan Transactions			3.00%		5.00%
Loss Reserves [Member]
Insurance [Line Items]
Weighted average risk-free rate used to discount loss reserves			1.80%		2.40%

X

- Definition

Accumulated Amortization on Intangible Asset

+ References

No definition available.

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- Definition

This element represents the reduction to gross claim liability for subrogation on insured RMBS financial obligations with credit deterioration.

+ References

No definition available.

+ Details

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- Definition

This element represents the reduction to gross claim liability for subrogation on insured RMBS financial obligations with credit deterioration, net of reinsurance.

+ References

No definition available.

+ Details

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- Definition

Weighted average discounted rate of estimated future premium payments to be paid by the VIEs.

+ References

No definition available.

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- Definition

Insurance [Line Items]

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No definition available.

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- Definition

The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims expected to be paid or incurred by the ceding insurer.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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- Definition

Percentage Of Premiums Receivable Related To Non Investment Grade Structured Ins Transactions

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Percentage of Premiums Receivable Related to Non Investment Grade Lease Securitizations

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
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- Definition

This element represents the amount of premium revenue on financial guarantee insurance contracts recognized during the period that was accelerated for revenue recognition purposes.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

This element represents the weighted average risk free rate used to discount the claim liability related to financial guarantee insurance contracts.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Weighted average period over which premium receivable for financial guarantee insurance contracts is collected where premium is received over the contract period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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- Definition

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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- Definition

Amount of reduction of provision for policy benefits and costs incurred for policies ceded.

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- Definition

The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements.

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