XML 110 R88.htm IDEA: XBRL DOCUMENT v3.8.0.1
Investments - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investment [Line Items]      
Cash recoveries   $ 995,000  
Securities fair value $ 5,974 5,872  
Fair value of securities held by bankruptcy remote trust 346,212 360,759  
Successor [Member]      
Investment [Line Items]      
Other Investments 431,630 450,307  
Unrealized losses on securities 86,480 29,944  
Other investments 23,179 32,318 $ 16,952
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 108,043 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 1,855,694 890,952  
Gross unrealized loss 100,503 53,273  
Ambac Wrapped Securities [Member] | Successor [Member]      
Investment [Line Items]      
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 30,482    
Gains (losses) on securities held as of reporting date [Member] | Successor [Member]      
Investment [Line Items]      
Other investments 13,388 20,180 $ 7,649
Real Estate [Member] | Successor [Member]      
Investment [Line Items]      
Other Investments 33,154 33,303  
Hedge Funds, Multi-strategy [Member] | Successor [Member]      
Investment [Line Items]      
Other Investments 53,054 53,985  
Interest Rate Contract [Member] | Successor [Member]      
Investment [Line Items]      
Other Investments 136,603 261,315  
Illiquid Investments [Member] | Successor [Member]      
Investment [Line Items]      
Other Investments 67,787 39,068  
Insurance Linked [Member] | Successor [Member]      
Investment [Line Items]      
Other Investments 22,666 0  
Equity [Member] | Successor [Member]      
Investment [Line Items]      
Other Investments 53,675 32,633  
Equity investments in pooled funds [Member] | Successor [Member]      
Investment [Line Items]      
Other Investments 366,939 420,304  
Reported Value Measurement [Member] | Interest Rate Contract [Member] | Successor [Member]      
Investment [Line Items]      
Other Investments $ 2,823 $ 51,158