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Variable Interest Entities - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jul. 31, 2015
USD ($)
Dec. 31, 2018
USD ($)
Entity
Dec. 31, 2017
USD ($)
Entity
Dec. 31, 2016
USD ($)
Feb. 12, 2018
USD ($)
Variable Interest Entities [Line Items]          
satisfaction and discharge of segregated account deferred amounts         $ 3,000,158,000
satisfaction and discharge of segregated account deferred interest amounts         856,834,000
Variable Interest Entity Change in Fair Value of Assets and Liabilities   $ 2,782,000 $ 19,670,000 $ (14,093,000)  
Available-for-sale Securities   3,546,006,000      
variable interest entities deconsolidation gain loss   1,824,000 0 0  
Variable Interest Entity, Measure of Activity, Income or Loss before Tax   3,436,000 19,670,000 (14,093,000)  
Secured Debt   0 73,993,000    
Fair value of special purpose entities   4,516,000 5,979,000    
Consolidated VIE assets   7,093,309,000 14,500,507,000    
Consolidated VIE liabilities   6,981,244,000 14,366,434,000    
Number of RMBS Sold 17        
Cash Received From Delaware Trust $ 146,000,000        
Securities Issued by Delaware Trust $ 146,000,000        
Equity Method Investments   40,168,000 34,941,000    
Loans, Unpaid principal balance   19,191,000 20,184,000    
Other Investments   391,217,000 431,630,000    
Deconsolidated VIE Assets   6,619,857,000      
Deconsolidated VIE Liabilities   6,599,925,000      
Long-term debt   $ 2,928,929,000 991,696,000    
Asset-Backed Securities and Utility Obligations [Member]          
Variable Interest Entities [Line Items]          
Weighted average life   2 years 1 month 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   $ 393,010,000 420,600,000    
Variable Interest Entity, Primary Beneficiary [Member]          
Variable Interest Entities [Line Items]          
Available-for-sale Securities   2,737,286,000 2,914,145,000    
Secured Debt       $ 0  
Long-term debt   5,268,596,000 12,160,544,000    
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   (1,170,000)      
Available-for-sale Securities   2,737,286,000 2,914,145,000    
Loans, Estimated fair value   4,287,664,000 11,529,384,000    
Loans, Unpaid principal balance   3,402,413,000 8,168,651,000    
Long-term Debt, Fair Value   5,268,596,000 12,160,544,000    
Long-term debt, Unpaid principal balance   $ 4,552,643,000 $ 9,387,884,000    
Consolidated Entities [Member]          
Variable Interest Entities [Line Items]          
Number of DeConsolidated Variable Interest Entities   4 1 1  
Number of consolidated Variable Interest Entities | Entity   7 11    
Ambac UK [Member]          
Variable Interest Entities [Line Items]          
Number of consolidated Variable Interest Entities | Entity   7 8    
Consolidated VIE assets   $ 7,093,309,000 $ 14,160,152,000    
Consolidated VIE liabilities   $ 6,981,244,000 $ 14,026,704,000    
Ambac Assurance [Member]          
Variable Interest Entities [Line Items]          
Number of consolidated Variable Interest Entities | Entity   0 3    
Secured Notes Received from Ambac LSNI         643,583,000
Carry Value Secured Notes from LSNI   $ 584,622,000      
Unsettled Amounts Secured Notes from LSNI   19,405,000      
AFG [Member]          
Variable Interest Entities [Line Items]          
Secured Notes Received from Ambac LSNI         $ 124,881,000
Carry Value Secured Notes from LSNI   71,851,000      
London Interbank Offered Rate (LIBOR) [Member]          
Variable Interest Entities [Line Items]          
Interest Rate on Securities Issued by Delaware Trust 2.80%        
Corporate Debt Securities [Member]          
Variable Interest Entities [Line Items]          
Available-for-sale Securities   2,737,286,000 $ 2,914,145,000    
Variable Interest Entity Purchased Debt [Member]          
Variable Interest Entities [Line Items]          
Other Investments   $ 0 $ 35,000,000