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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