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Investments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended 3 Months Ended 4 Months Ended 8 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Successor Ambac [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Mar. 31, 2013
National Century Financial Enterprises, Inc. [Member]
Apr. 30, 2013
National Century Financial Enterprises, Inc. [Member]
Dec. 31, 2013
National Century Financial Enterprises, Inc. [Member]
Dec. 31, 2013
Residential Mortgage-Backed Securities [Member]
Dec. 31, 2013
Ambac-wrapped Securities [Member]
Dec. 31, 2013
Other Asset-Backed Securities [Member]
Dec. 31, 2013
Asset Backed, Military Housing, Fixed Rate Securities [Member]
Security
Investment [Line Items]                          
Fair value of below investment grade securities and non-rated securities $ 826,969 $ 192,190                      
Gross unrealized loss 36,946 43,934                      
Percentage of permitted policy claim 25.00%                        
Unrealized losses on securities     116,634     7,551       18,105 12,169 36,598 36,281
Number of securities in unrealized loss position                         6
Investment realized losses     4,467 53,305   72,101 150,201            
Investment in asset backed notes             174,500            
Cash recoveries         14,007     39,978          
Other recoveries                 1,441        
Securities fair value 6,799 6,945                      
Fair value of securities held by bankruptcy remote trust 240,150 201,329                      
Other investments   $ 0 $ 3,580 $ 369