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Investments - Additional Information (Detail) - USD ($)
$ in Thousands
4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2013
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Investment [Line Items]        
Payment of permitted policy claim (percent)       25.00%
Future payment of permitted policy claim (percent)       45.00%
Securities fair value     $ 6,762 $ 6,790
Fair value of securities held by bankruptcy remote trust     396,100 0
Successor [Member]        
Investment [Line Items]        
Unrealized losses on securities     82,799 20,081
Other investments   $ 3,580 16,952 8,108
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments     104,206 32,269
Predecessor [Member]        
Investment [Line Items]        
Other investments $ 369      
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     953,000 473,656
Gross unrealized loss     69,214 16,001
Ambac Wrapped Securities [Member] | Successor [Member]        
Investment [Line Items]        
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments     63,127  
Gains (losses) on securities held as of reporting date [Member] | Successor [Member]        
Investment [Line Items]        
Other investments   1,878 7,649 7,200
Gains (losses) on securities held as of reporting date [Member] | Predecessor [Member]        
Investment [Line Items]        
Other investments 369      
National Century Financial Enterprises, Inc. [Member]        
Investment [Line Items]        
Cash recoveries $ 39,978 $ 1,441 96 35
Fixed Income Securities [Member] | Successor [Member]        
Investment [Line Items]        
Unrealized losses on securities     82,741 19,966
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member] | Successor [Member]        
Investment [Line Items]        
Unrealized losses on securities     53,367 12,391
Fixed Income Securities [Member] | Asset-backed Securities [Member] | Successor [Member]        
Investment [Line Items]        
Unrealized losses on securities     $ 3,456 $ 155