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Financial Guarantee Insurance Contracts - Summary of Balance of RMBS Subrogation Recoveries and Related Claim Liabilities, by Estimation Approach (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items]        
Balance Of Rmbs Subrogation Recoveries Net Of Reinsurance $ (1,864,943)   $ (1,878,740)  
Successor [Member]        
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items]        
Subrogation recoveries 1,892,974   1,907,035  
Successor [Member] | 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 1,348,141   1,351,640  
Subrogation recoveries 1,892,974   1,907,035  
Gross loss reserve after subrogation recoveries (544,833)   (555,395)  
Random Samples [Member] | Successor [Member]        
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items]        
Subrogation recoveries 1,892,974 $ 1,855,073 $ 1,907,035 $ 2,829,575
Impact Of Sponsor Actions In Residential Mortgage Backed Securities Subrogation 0 (995,000)    
Other Changes Rmbs Subrogation $ (14,061) $ 20,498