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Financial Guarantee Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Detail) € in Thousands, $ in Thousands | 12 Months Ended |  |  |  |  |
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Feb. 12, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) | $ (15,491) |  | $ 28,939 |  | $ (77,578) |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | (223,613) |  | 513,186 |  | (11,489) |  |  |  |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  |  |  |  |  | $ 510 |  | $ 339 | $ (349) |
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation |  |  |  |  |  | (1,770,546) |  | (1,834,387) |  |
Policyholder Benefits and Claims Incurred, Ceded | (1,657) |  | 20,348 |  | (5,421) |  |  |  |  |
Net Incurred RMBS Subrogation Recoveries | (62,493) |  | (72,003) |  | 71,369 |  |  |  |  |
satisfaction and discharge of segregated account deferred amounts |  |  |  |  |  |  | $ 3,000,158 |  |  |
satisfaction and discharge of segregated account deferred interest amounts |  |  |  |  |  |  | 856,834 |  |  |
Loss and Loss Expense Benefit on Settled Deferred Amounts |  |  |  |  |  |  | $ 288,204 |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning gross loss and loss expense reserves | 4,113,802 |  | 3,696,038 |  | 2,858,813 |  |  |  |  |
Less reinsurance on loss and loss expense reserves | 40,658 |  | 30,767 |  | 44,059 |  |  |  |  |
Beginning balance of net loss and loss expense reserves | 4,073,144 |  | 3,665,271 |  | 2,814,754 |  |  |  |  |
Current year: |  |  |  |  |  |  |  |  |  |
Claim and loss expense payments, net of subrogation and reinsurance | (204) |  | (825) |  | (5,371) |  |  |  |  |
Prior years: |  |  |  |  |  |  |  |  |  |
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance | (3,963,341) |  | (133,427) |  | 944,955 |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 4,073,144 |  | 3,665,271 |  | 2,814,754 | (129,505) |  | 4,073,144 | 3,665,271 | $ 2,814,754
Add reinsurance on loss and loss expense reserves | 22,623 |  | 40,658 |  | 30,767 |  |  |  |  |
Ending gross loss and loss expense reserves | (106,882) |  | 4,113,802 |  | 3,696,038 |  |  |  |  |
Balance Of Rmbs Subrogation Recoveries Net Of Reinsurance |  |  |  |  |  | (1,744,243) |  | (1,806,736) |  |
Current Year Claims and Claims Adjustment Expense | 4,884 |  | 5,691 |  | 6,675 |  |  |  |  |
Prior Year Claims and Claims Adjustment Expense | (228,497) |  | 507,495 |  | (18,164) |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid | 3,963,545 |  | 134,252 |  | (939,584) |  |  |  |  |
Euro Member Countries, Euro |  |  |  |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning gross loss and loss expense reserves | 21,116 | € 17,582 | 21,375 | € 20,297 |  |  |  |  |  |
Prior years: |  |  |  |  |  |  |  |  |  |
Ending gross loss and loss expense reserves | $ 3,328 | € 2,905 | $ 21,116 | € 17,582 | $ 21,375 |  |  |  |  |
Random Samples [Member] |  |  |  |  |  |  |  |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |  |  |  |  |  |  |
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation |  |  |  |  |  | $ (1,770,546) |  | $ (1,834,387) | $ (1,907,035) | $ (2,829,575)

X
- 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 Ceded Loss And Loss Expenses Paid Not Yet Recovered + References No definition available. + Details
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- Definition Changes in liability for unpaid claims and claims adjustment expense related to reserves and recoveries established in the current year, net of reinsurance. + References No definition available. + Details
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- Definition Liability for Unpaid Claims and Claims Adjustment Expense Changes in Prior Years [Abstract] + References No definition available. + Details
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- Definition Loss And Loss Adjustment Expense Reserves [Line Items] + References No definition available. + Details
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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 Net Incurred RMBS Subrogation Recoveries + References No definition available. + Details
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- Definition satisfaction and discharge of segregated account deferred amounts + References No definition available. + Details
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- Definition satisfaction and discharge of segregated account deferred interest amounts + 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. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition Amount of foreign currency gain (loss) which decreases (increases) the cost of settling unpaid claims after deduction of reinsurance recoveries. Includes, but is not limited to, claims which have been incurred but not reported. + References No definition available. + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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- Definition Amount of reduction of provision for policy benefits and costs incurred for policies ceded. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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