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Financial Guarantee Insurance Contracts - Estimated Future Amortization Expense for Insurance Intangible Asset (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Insurance Intangible Asset [Member] |  |  |  |  |  |  |  |  |  |  |
Amortization Of Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
2018 | $ 76,638 |  |  |  |  |  |  |  | $ 76,638 |  |
2019 | 69,082 |  |  |  |  |  |  |  | 69,082 |  |
2020 | 63,892 |  |  |  |  |  |  |  | 63,892 |  |
2021 | 58,207 |  |  |  |  |  |  |  | 58,207 |  |
2022 | 53,908 |  |  |  |  |  |  |  | 53,908 |  |
Thereafter | 525,246 |  |  |  |  |  |  |  | 525,246 |  |
Successor [Member] |  |  |  |  |  |  |  |  |  |  |
Amortization Of Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of insurance intangible assets | 34,168 | $ 45,690 | $ 33,471 | $ 37,525 | $ 40,152 | $ 44,553 | $ 39,013 | $ 50,890 | 150,854 | $ 174,608 | $ 169,557
Intangible Assets, Gross (Excluding Goodwill) | 1,581,156 |  |  |  | 1,534,419 |  |  |  | 1,581,156 | 1,534,419 |
Accumulated amortization on insurance intangible asset | $ 734,183 |  |  |  | $ 572,339 |  |  |  | 734,183 | 572,339 |
Successor [Member] | Insurance Asset [Member] |  |  |  |  |  |  |  |  |  |  |
Amortization Of Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of insurance intangible assets |  |  |  |  |  |  |  |  | $ 150,854 | $ 174,608 | $ 169,557

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- Definition Amortization Of Intangible Assets [Line Items] + References No definition available. + Details
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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 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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