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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2015
USD ($)
Mar. 31, 2018
USD ($)
Entity
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Entity
Sep. 30, 2017
USD ($)
Variable Interest Entities [Line Items]          
Equity Method Investments   $ 36,209   $ 34,941  
Number of RMBS Sold 17        
Cash Received From Delaware Trust $ 146,000        
Secured Debt   65,196   73,993  
Par Value of Securities Placed in Trust         $ 285,437
Fair Value of Securities Placed in Trust   256,553   346,212 $ 256,553
Securities Issued by Delaware Trust $ 146,000        
Consolidated VIE assets   14,565,123   14,500,507  
Consolidated VIE liabilities   14,428,632   14,366,434  
Successor [Member]          
Variable Interest Entities [Line Items]          
Variable Interest Entity Change in Fair Value of Assets and Liabilities   1,918 $ 3,701    
Fair value of special purpose entities   5,621   5,979  
variable interest entities deconsolidation gain loss   0 0    
Variable Interest Entity, Measure of Activity, Income or Loss before Tax   574 3,701    
Other investments   $ 419,896   431,630  
Asset-Backed Securities and Utility Obligations [Member]          
Variable Interest Entities [Line Items]          
Weighted average life   2 years 10 months 15 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   $ 436,080   $ 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, after Tax   $ 1,344 $ 0    
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 0  
Number of consolidated Variable Interest Entities | Entity   11   11  
Ambac UK [Member]          
Variable Interest Entities [Line Items]          
Number of consolidated Variable Interest Entities | Entity   8   8  
Consolidated VIE assets   $ 14,247,950   $ 14,160,152  
Consolidated VIE liabilities   $ 14,111,885   $ 14,026,704  
Ambac Assurance [Member]          
Variable Interest Entities [Line Items]          
Number of consolidated Variable Interest Entities | Entity       3  
London Interbank Offered Rate (LIBOR) [Member]          
Variable Interest Entities [Line Items]          
Interest Rate on Securities Issued by Delaware Trust 2.80%