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Financial Guarantee Insurance Contracts - Estimated Future Amortization Expense for Insurance Intangible Asset (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amortization Of Intangible Assets [Line Items]                      
Amortization of insurance intangible assets $ 28,982 $ 26,421 $ 23,242 $ 28,636 $ 34,168 $ 45,690 $ 33,471 $ 37,525 $ 107,281 $ 150,854 $ 174,608
Intangible Assets, Gross (Excluding Goodwill) 1,551,576       $ 1,581,156       1,551,576 1,581,156  
Insurance Asset [Member]                      
Amortization Of Intangible Assets [Line Items]                      
Amortization of insurance intangible assets                 107,281 $ 150,854 $ 174,608
Insurance Intangible Asset [Member]                      
Amortization Of Intangible Assets [Line Items]                      
2018 63,665               63,665    
2019 58,755               58,755    
2020 53,419               53,419    
2021 49,681               49,681    
2022 46,342               46,342    
Thereafter $ 447,069               $ 447,069