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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2015
USD ($)
Sep. 30, 2018
USD ($)
Entity
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Entity
Sep. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Feb. 12, 2018
USD ($)
Dec. 31, 2017
USD ($)
Entity
Dec. 31, 2016
Entity
Variable Interest Entities [Line Items]                  
Equity Method Investments   $ 38,830   $ 38,830       $ 34,941  
Number of RMBS Sold 17                
Cash Received From Delaware Trust $ 146,000                
Secured Debt   0   0       73,993  
Fair Value of Securities Placed in Trust   0   0       346,212  
Securities Issued by Delaware Trust $ 146,000                
Consolidated VIE assets   7,347,422   7,347,422       14,500,507  
Consolidated VIE liabilities   7,245,870   7,245,870       14,366,434  
Successor [Member]                  
Variable Interest Entities [Line Items]                  
Variable Interest Entity Change in Fair Value of Assets and Liabilities   386 $ (4,049) 1,854 $ (1,567)        
Deconsolidated VIE Assets   6,471,015   6,471,015          
Deconsolidated VIE Liabilities   6,451,078   6,451,078          
Fair value of special purpose entities   4,887   4,887       5,979  
variable interest entities deconsolidation gain loss   1,824 0 1,824 0        
Variable Interest Entity, Measure of Activity, Income or Loss before Tax   1,831 (4,049) 2,982 (1,567)        
Other investments   411,604   $ 411,604       431,630  
Asset-Backed Securities and Utility Obligations [Member]                  
Variable Interest Entities [Line Items]                  
Weighted average life       2 years 4 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   406,350   $ 406,350       $ 420,600  
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   $ (379) $ 0 $ (696) $ 0        
Consolidated Entities [Member]                  
Variable Interest Entities [Line Items]                  
Number of Newly Consolidated Variable Interest Entities   0 0   0        
Number of DeConsolidated Variable Interest Entities   0 0 2 0        
Number of consolidated Variable Interest Entities | Entity   8   8       11  
Ambac UK [Member]                  
Variable Interest Entities [Line Items]                  
Number of consolidated Variable Interest Entities | Entity   7   7       8 8
Consolidated VIE assets   $ 7,209,445   $ 7,209,445       $ 14,160,152  
Consolidated VIE liabilities   $ 7,107,889   $ 7,107,889       $ 14,026,704  
Ambac Assurance [Member]                  
Variable Interest Entities [Line Items]                  
Number of consolidated Variable Interest Entities | Entity   1   1       3 3
Secured Notes Received from Ambac LSNI             $ 643,583    
CarryValueSecuredNotesfromLSNI           $ 598,321      
Unsettled Amounts Secured Notes from LSNI           32,894      
Afg [Member]                  
Variable Interest Entities [Line Items]                  
Secured Notes Received from Ambac LSNI             $ 124,881    
CarryValueSecuredNotesfromLSNI           115,683      
Unsettled Amounts Secured Notes from LSNI           $ 6,360      
London Interbank Offered Rate (LIBOR) [Member]                  
Variable Interest Entities [Line Items]                  
Interest Rate on Securities Issued by Delaware Trust 2.80%