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Investments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Investment [Line Items]            
Securities fair value $ 6,019     $ 6,019   $ 5,872
Fair Value of Securities Placed in Trust 351,339     351,339   360,759
Successor [Member]            
Investment [Line Items]            
Other investments 439,987     439,987   450,307
Unrealized losses on securities 20,055     20,055   29,944
Cash recoveries     $ 995,000      
Other investments 6,178 $ 11,387   18,804 $ 20,616  
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 43,995     43,995   79,642
Below Investment Grade Securities and Non-Rated Securities [Member] | Successor [Member]            
Investment [Line Items]            
Fair value of below investment grade securities and non-rated securities 1,090,352     1,090,352   890,952
Gross unrealized loss 35,661     35,661   53,273
Ambac Wrapped Securities [Member]            
Investment [Line Items]            
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 18,933     18,933    
Gains (losses) on securities held as of reporting date [Member] | Successor [Member]            
Investment [Line Items]            
Other investments (105) $ 8,338   6,990 $ 11,877  
Ambac UK [Member]            
Investment [Line Items]            
Asset Backed Securities Fair Value Disclosure 171,034     171,034   118,813
Interest Rate Contract [Member] | Successor [Member]            
Investment [Line Items]            
Other investments 151,650     151,650   261,315
Reported Value Measurement [Member] | Interest Rate Contract [Member] | Successor [Member]            
Investment [Line Items]            
Other investments $ 27,761     $ 27,761   $ 51,158