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v3.19.1

Special Purpose Entities, Including Variable Interest Entities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) Entity | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) Entity
Variable Interest Entities [Line Items] |  |  |  |
Variable Interest Entity Change in Fair Value of Assets and Liabilities | $ 1,836 | $ 1,918 |  |
Equity Method Investments | 41,511 |  |  | $ 40,168
Deconsolidated VIE Assets | 292,003 |  |  |
Deconsolidated VIE Liabilities | 363,628 |  |  |
Fair value of special purpose entities | 4,148 |  |  | 4,516
variable interest entities deconsolidation gain loss | 14,864 |  | $ 0 |
Variable Interest Entity, Measure of Activity, Income or Loss before Tax | 15,921 | 574 |  |
Other investments | 428,556 |  |  | 391,217
Long-term debt | $ 2,929,227 |  |  | 2,928,929
Asset-Backed Securities and Utility Obligations [Member] |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Weighted average life | 1 year 10 months 24 days |  |  |
Average rating of assets held by sponsored special purpose entities | BBB+ |  |  |
Sponsored Variable Interest Entities [Member] |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Total principal amount of debt outstanding | $ 400,600 |  |  | 393,010
Variable Interest Entities [Member] |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, before Tax | (171) | (1,344) |  |
VIE Change in FV of Assets Liabilities, Net of Credit Risk Change | 1,665 | 574 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Interest Expense, Long-term Debt | (2,356) | 0 |  |
Other Expenses | (111) | $ 0 |  |
Long-term debt | $ 5,737,263 |  |  | $ 5,268,596
Consolidated Entities [Member] |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Number of Newly Consolidated Variable Interest Entities | 0 | 0 |  |
Number of DeConsolidated Variable Interest Entities | 0 | 0 |  |
Number Of Consolidated Variable Interest Entities | Entity | 8 |  |  | 7
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Number of Newly Consolidated Variable Interest Entities | 1 |  |  |
Number of DeConsolidated Variable Interest Entities | 0 |  |  |
Ambac UK [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Long-term debt | $ 5,401,992 |  |  | $ 5,268,596
Ambac UK [Member] | Consolidated Entities [Member] |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 7 |  |  | 7
Ambac Assurance [Member] |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Carry Value Secured Notes from LSNI | $ 583,550 |  |  | $ 656,473
Fixed Income Investments [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Gross Investment Income, Operating | 1,859 | $ 0 |  |
Ambac Note Post Exit From Rehabilitation [Member] | Ambac Assurance Corporation [Member] |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |
Long-term debt | $ 1,927,144 |  |  | $ 1,940,289

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