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Financial Guarantee Insurance Contracts - Summary of Rollforward of RMBS Subrogation, by Estimation Approach (Detail) - USD ($)
$ in Thousands
 4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2013
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Successor [Member]        
Subrogation By Estimation Approach [Roll Forward]        
Discounted RMBS subrogation (gross of reinsurance), beginning balance   $ 2,482,918 $ 2,523,540 $ 2,206,598
Changes recognized        
Additional Transactions Reviewed Changes in RMBS Subrogation   2,451 0 24,565
Changes in Estimation Approach In Rmbs Subrogation   0 0 198,875
Impact of sponsor actions   98 0 (146,270)
Other Changes Rmbs Subrogation   (278,869) 306,035 239,772
Discounted RMBS subrogation (gross of reinsurance), ending balance $ 2,482,918 2,206,598 2,829,575 2,523,540
Predecessor [Member]        
Subrogation By Estimation Approach [Roll Forward]        
Discounted RMBS subrogation (gross of reinsurance), beginning balance 2,523,225 2,482,918    
Changes recognized        
Additional Transactions Reviewed Changes in RMBS Subrogation 0      
Changes in Estimation Approach In Rmbs Subrogation 0      
Impact of sponsor actions (54,195)      
Other Changes Rmbs Subrogation 13,888      
Discounted RMBS subrogation (gross of reinsurance), ending balance 2,482,918      
Random Samples [Member] | Successor [Member]        
Subrogation By Estimation Approach [Roll Forward]        
Discounted RMBS subrogation (gross of reinsurance), beginning balance   1,004,252 2,523,540 953,825
Changes recognized        
Additional Transactions Reviewed Changes in RMBS Subrogation   2,451 0 24,565
Changes in Estimation Approach In Rmbs Subrogation   0 0 1,417,556
Impact of sponsor actions   0 0 (146,270)
Other Changes Rmbs Subrogation   (52,878) 306,035 273,864
Discounted RMBS subrogation (gross of reinsurance), ending balance 1,004,252 953,825 2,829,575 2,523,540
Random Samples [Member] | Predecessor [Member]        
Subrogation By Estimation Approach [Roll Forward]        
Discounted RMBS subrogation (gross of reinsurance), beginning balance 1,080,408 1,004,252    
Changes recognized        
Additional Transactions Reviewed Changes in RMBS Subrogation 0      
Changes in Estimation Approach In Rmbs Subrogation 0      
Impact of sponsor actions (54,195)      
Other Changes Rmbs Subrogation (21,961)      
Discounted RMBS subrogation (gross of reinsurance), ending balance 1,004,252      
Adverse Samples [Member] | Successor [Member]        
Subrogation By Estimation Approach [Roll Forward]        
Discounted RMBS subrogation (gross of reinsurance), beginning balance   1,478,666 0 1,252,773
Changes recognized        
Additional Transactions Reviewed Changes in RMBS Subrogation   0 0 0
Changes in Estimation Approach In Rmbs Subrogation   0 0 (1,218,681)
Impact of sponsor actions   98 0 0
Other Changes Rmbs Subrogation   (225,991) 0 (34,092)
Discounted RMBS subrogation (gross of reinsurance), ending balance 1,478,666 1,252,773 $ 0 $ 0
Adverse Samples [Member] | Predecessor [Member]        
Subrogation By Estimation Approach [Roll Forward]        
Discounted RMBS subrogation (gross of reinsurance), beginning balance 1,442,817 $ 1,478,666    
Changes recognized        
Additional Transactions Reviewed Changes in RMBS Subrogation 0      
Changes in Estimation Approach In Rmbs Subrogation 0      
Impact of sponsor actions 0      
Other Changes Rmbs Subrogation 35,849      
Discounted RMBS subrogation (gross of reinsurance), ending balance $ 1,478,666