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Investments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Investment [Line Items]            
Securities fair value $ 6,021     $ 6,021   $ 5,872
Fair Value of Securities Placed in Trust 352,446     352,446   360,759
Successor [Member]            
Investment [Line Items]            
Other investments 452,032     452,032   450,307
Unrealized losses on securities 21,985     21,985   29,944
Cash recoveries     $ 995,000      
Other investments 4,217 $ 6,390   12,626 $ 9,229  
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 62,108     62,108   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 997,251     997,251   890,952
Gross unrealized loss 49,242     49,242   53,273
Ambac Wrapped Securities [Member]            
Investment [Line Items]            
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 32,184     32,184    
Gains (losses) on securities held as of reporting date [Member] | Successor [Member]            
Investment [Line Items]            
Other investments 930 $ 3,742   6,513 $ 5,417  
Ambac UK [Member]            
Investment [Line Items]            
Asset Backed Securities Fair Value Disclosure 169,672     169,672   118,813
Interest Rate Contract [Member] | Successor [Member]            
Investment [Line Items]            
Other investments 223,364     223,364   261,315
Reported Value Measurement [Member] | Interest Rate Contract [Member] | Successor [Member]            
Investment [Line Items]            
Other investments $ 52,264     $ 52,264   $ 51,158