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Financial Guarantee Insurance Contracts - Summary of Balance of RMBS Subrogation Recoveries and Related Claim Liabilities, by Estimation Approach (Detail) - Successor [Member] - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items]        
Subrogation recoveries $ 1,923,256   $ 2,829,575  
Random Samples [Member]        
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items]        
Gross loss reserve before subrogation recoveries 1,364,835   1,850,804  
Subrogation recoveries 1,923,256   2,829,575  
Gross loss reserve after subrogation recoveries (558,421)   (978,771)  
Random Samples [Member]        
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items]        
Subrogation recoveries 1,923,256 $ 2,555,461 $ 2,829,575 $ 2,523,540
Impact Of Sponsor Actions In Residential Mortgage Backed Securities Subrogation (995,000) 0    
Other Changes Rmbs Subrogation $ 88,681 $ 31,921