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Investments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Investment [Line Items]          
Securities fair value $ 5,912   $ 5,912   $ 5,974
Fair Value of Securities Placed in Trust 0   0   346,212
Successor [Member]          
Investment [Line Items]          
Other investments 394,396   394,396   431,630
Unrealized losses on securities 17,304   17,304   86,480
Other investments 4,920 $ 4,217 4,609 $ 12,626  
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 34,773   34,773   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 176,712   176,712   1,855,694
Gross unrealized loss 12,293   12,293   100,503
Gains (losses) on securities held as of reporting date [Member] | Successor [Member]          
Investment [Line Items]          
Other investments 3,288 $ 930 728 $ 6,513  
Ambac Assurance [Member]          
Investment [Line Items]          
Unsettled Amounts Secured Notes from LSNI 50,878   50,878    
Ambac UK [Member]          
Investment [Line Items]          
Asset Backed Securities Fair Value Disclosure 172,531   172,531   170,280
Interest Rate Contract [Member] | Successor [Member]          
Investment [Line Items]          
Other investments 145,981   145,981   136,603
Reported Value Measurement [Member] | Interest Rate Contract [Member] | Successor [Member]          
Investment [Line Items]          
Other investments $ 2,866   $ 2,866   $ 2,823