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Investments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Investment [Line Items]            
Securities fair value $ 5,893   $ 5,893     $ 5,974
Fair Value of Securities Placed in Trust 0   0     346,212
Successor [Member]            
Investment [Line Items]            
Other investments 411,604   411,604     431,630
Unrealized losses on securities 13,110   13,110     86,480
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 21,618   21,618     108,043
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 90,814   90,814     1,855,694
Gross unrealized loss 1,405   1,405     100,503
Gains (losses) on securities held as of reporting date [Member] | Successor [Member]            
Investment [Line Items]            
Other investments 6,402 $ (105) 11,134 $ 6,990    
Ambac Assurance [Member]            
Investment [Line Items]            
Unsettled Amounts Secured Notes from LSNI         $ 32,894  
Ambac UK [Member]            
Investment [Line Items]            
Asset Backed Securities Fair Value Disclosure 141,373   141,373     170,280
Interest Rate Contract [Member] | Successor [Member]            
Investment [Line Items]            
Other investments $ 179,856   $ 179,856     136,603
Reported Value Measurement [Member] | Interest Rate Contract [Member] | Successor [Member]            
Investment [Line Items]            
Other investments         $ 2,914 $ 2,823