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Background and Business Description - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Segment
$ / shares
shares
Dec. 31, 2014
Dec. 31, 2015
$ / shares
shares
Apr. 30, 2013
$ / shares
shares
Background And Basis Of Presentation [Line Items]        
Entity Incorporation, Date of Incorporation Apr. 29, 1991      
Number of reportable segments | Segment 2      
Investment Warrants Expiration Date   Apr. 30, 2023    
Payment of permitted policy claim (percent)   25.00%    
Common stock, shares authorized 130,000,000   130,000,000  
Common Stock, Par or Stated Value Per Share | $ / shares $ 0.01   $ 0.01 $ 0.01
Preferred stock, shares authorized 20,000,000   20,000,000  
Preferred Stock, Par or Stated Value Per Share | $ / shares $ 0.01   $ 0.01  
Common stock, shares issued 45,047,686   45,044,222  
Warrants Distributed In Bankruptcy       5,047,138
Warrants issued exercise price | $ / shares       $ 16.67
Ambac Assurance [Member]        
Background And Basis Of Presentation [Line Items]        
Net par exposure for policies allocated to the Segregated Account | $ $ 13,832,551,000      
Minimum surplus amount | $ 100,000,000      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ $ 646,492,000      
Successor [Member]        
Background And Basis Of Presentation [Line Items]        
Common stock, shares issued       45,000,000
Warrants Distributed In Bankruptcy       5,047,138