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Investments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
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 $ 6,816   $ 6,816   $ 6,790
Successor [Member]          
Investment [Line Items]          
Unrealized losses on securities 67,720   67,720   20,081
Other investments 2,475 $ 3,211 12,126 $ 5,205  
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 81,102   81,102   32,269
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 870,719   870,719   473,656
Gross unrealized loss 48,196   48,196   16,001
Ambac Wrapped Securities [Member] | Successor [Member]          
Investment [Line Items]          
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 43,485   43,485    
Gains (losses) on securities held as of reporting date [Member] | Successor [Member]          
Investment [Line Items]          
Other investments (1,650) $ 3,217 $ 4,589 $ 5,636  
National Century Financial Enterprises, Inc. [Member]          
Investment [Line Items]          
Cash recoveries $ 0       $ 35