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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 8 Months Ended 12 Months Ended 8 Months Ended 0 Months Ended 4 Months Ended 12 Months Ended 12 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended
Apr. 30, 2013
Dec. 31, 2013
Dec. 31, 2013
Entity
Assets
Dec. 31, 2012
Entity
Assets
Dec. 31, 2013
Asset-Backed Securities and Utility Obligations [Member]
Dec. 31, 2013
Variable Interest Entities [Member]
Dec. 31, 2012
Variable Interest Entities [Member]
Dec. 31, 2013
Variable Interest Entity [Member]
Dec. 31, 2013
Successor Ambac [Member]
Dec. 31, 2013
Successor Ambac [Member]
Variable Interest Entity [Member]
Apr. 30, 2013
Successor Ambac [Member]
Variable Interest Entity [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Variable Interest Entity [Member]
Dec. 31, 2013
Sponsored Variable Interest Entities [Member]
Transactions
Dec. 31, 2012
Sponsored Variable Interest Entities [Member]
Dec. 31, 2013
Financial Guarantee [Member]
Successor Ambac [Member]
Apr. 30, 2013
Financial Guarantee [Member]
Predecessor Ambac [Member]
Dec. 31, 2012
Financial Guarantee [Member]
Predecessor Ambac [Member]
Variable Interest Entities [Line Items]                                        
Debt outstanding to third parties under secured borrowing transaction           $ 0 $ 14,588                          
Securities fair value   240,150 240,150 201,329   240,150 201,329                          
Fair value of special purpose entities   13,384 13,384 14,557                                
Number of individual transactions with special purpose entities                               15        
Number of transactions outstanding with special purpose entities                               3        
Total principal amount of debt outstanding                               461,355 466,938      
Weighted average life         7 years 9 months 18 days                              
Average rating of assets held by sponsored special purpose entities     BBB                                  
Earned premiums for issuing the financial guarantee policies on the assets, MTNs and derivative contracts                 78       40 398            
Number of assets sold     0 0                                
Assets sold to special purpose entities                 2,747       1,455 14,691            
Claims on insurance policies issued to these entities     0                                  
Earned fees for providing other services under its financial guarantee policies                                   7 3 37
Amount received under derivative contracts                 2,372         7,356            
Amount paid under derivative contracts                         93              
Number of consolidated Variable Interest Entities     18 18                                
Consolidated VIE assets   15,988,697 15,988,697 17,841,863                                
Consolidated VIE liabilities   15,872,770 15,872,770 17,661,700                                
Gain on variable interest entity consolidation                       385,291                
Intangible assets recorded at fair value 164,520                                      
Weighted-average amortization period 16 years   9 years 4 months 24 days                                  
Amortization expense for intangible assets   5,015                                    
Intangible assets               76,140   76,140 164,520       164,520          
Reduction to the intangible assets carrying value   83,365                                    
Variable interest entity deconsolidation loss   $ 15,273