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Investments - Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Successor Ambac [Member]
Weighted Average Underlying Rating, CCC+ Rating [Member]
Ambac Assurance Corporation [Member]
Dec. 31, 2013
Successor Ambac [Member]
Weighted Average Underlying Rating, AA- Rating [Member]
Financial Guarantee [Member]
Dec. 31, 2013
Successor Ambac [Member]
Weighted Average Underlying Rating, A Rating [Member]
Assured Guaranty Municipal Corporation [Member]
Dec. 31, 2013
Successor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
MBIA Insurance Corporation [Member]
Dec. 31, 2013
Successor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Assured Guaranty Corporation [Member]
Dec. 31, 2013
Successor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Financial Guarantee Insurance Corporation [Member]
Dec. 31, 2013
Successor Ambac [Member]
Weighted Average Underlying Rating, BB Rating [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Weighted Average Underlying Rating, AA- Rating [Member]
Financial Guarantee [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Weighted Average Underlying Rating, A Rating [Member]
Assured Guaranty Municipal Corporation [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
MBIA Insurance Corporation [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Assured Guaranty Corporation [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Weighted Average Underlying Rating, B Rating [Member]
Ambac Assurance Corporation [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Weighted Average Underlying Rating, A- Rating [Member]
Financial Guarantee Insurance Corporation [Member]
Dec. 31, 2013
Municipal Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, CCC+ Rating [Member]
Ambac Assurance Corporation [Member]
Dec. 31, 2013
Municipal Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, AA- Rating [Member]
Financial Guarantee [Member]
Dec. 31, 2013
Municipal Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, A Rating [Member]
Assured Guaranty Municipal Corporation [Member]
Dec. 31, 2013
Municipal Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
MBIA Insurance Corporation [Member]
Dec. 31, 2013
Municipal Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Assured Guaranty Corporation [Member]
Dec. 31, 2013
Municipal Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Financial Guarantee Insurance Corporation [Member]
Dec. 31, 2013
Municipal Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, BB Rating [Member]
Dec. 31, 2012
Municipal Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, AA- Rating [Member]
Financial Guarantee [Member]
Dec. 31, 2012
Municipal Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, A Rating [Member]
Assured Guaranty Municipal Corporation [Member]
Dec. 31, 2012
Municipal Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
Dec. 31, 2012
Municipal Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
MBIA Insurance Corporation [Member]
Dec. 31, 2012
Municipal Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Assured Guaranty Corporation [Member]
Dec. 31, 2012
Municipal Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, B Rating [Member]
Ambac Assurance Corporation [Member]
Dec. 31, 2012
Municipal Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, A- Rating [Member]
Financial Guarantee Insurance Corporation [Member]
Dec. 31, 2013
Corporate Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, CCC+ Rating [Member]
Ambac Assurance Corporation [Member]
Dec. 31, 2013
Corporate Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, AA- Rating [Member]
Financial Guarantee [Member]
Dec. 31, 2013
Corporate Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, A Rating [Member]
Assured Guaranty Municipal Corporation [Member]
Dec. 31, 2013
Corporate Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
MBIA Insurance Corporation [Member]
Dec. 31, 2013
Corporate Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Assured Guaranty Corporation [Member]
Dec. 31, 2013
Corporate Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Financial Guarantee Insurance Corporation [Member]
Dec. 31, 2013
Corporate Obligations [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, BB Rating [Member]
Dec. 31, 2012
Corporate Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, AA- Rating [Member]
Financial Guarantee [Member]
Dec. 31, 2012
Corporate Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, A Rating [Member]
Assured Guaranty Municipal Corporation [Member]
Dec. 31, 2012
Corporate Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
Dec. 31, 2012
Corporate Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
MBIA Insurance Corporation [Member]
Dec. 31, 2012
Corporate Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Assured Guaranty Corporation [Member]
Dec. 31, 2012
Corporate Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, B Rating [Member]
Ambac Assurance Corporation [Member]
Dec. 31, 2012
Corporate Obligations [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, A- Rating [Member]
Financial Guarantee Insurance Corporation [Member]
Dec. 31, 2013
Mortgage and Asset-Backed Securities [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, CCC+ Rating [Member]
Ambac Assurance Corporation [Member]
Dec. 31, 2013
Mortgage and Asset-Backed Securities [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, AA- Rating [Member]
Financial Guarantee [Member]
Dec. 31, 2013
Mortgage and Asset-Backed Securities [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, A Rating [Member]
Assured Guaranty Municipal Corporation [Member]
Dec. 31, 2013
Mortgage and Asset-Backed Securities [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
MBIA Insurance Corporation [Member]
Dec. 31, 2013
Mortgage and Asset-Backed Securities [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Assured Guaranty Corporation [Member]
Dec. 31, 2013
Mortgage and Asset-Backed Securities [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Financial Guarantee Insurance Corporation [Member]
Dec. 31, 2013
Mortgage and Asset-Backed Securities [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, BB Rating [Member]
Dec. 31, 2012
Mortgage and Asset-Backed Securities [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, AA- Rating [Member]
Financial Guarantee [Member]
Dec. 31, 2012
Mortgage and Asset-Backed Securities [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, A Rating [Member]
Assured Guaranty Municipal Corporation [Member]
Dec. 31, 2012
Mortgage and Asset-Backed Securities [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
Dec. 31, 2012
Mortgage and Asset-Backed Securities [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
MBIA Insurance Corporation [Member]
Dec. 31, 2012
Mortgage and Asset-Backed Securities [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Assured Guaranty Corporation [Member]
Dec. 31, 2012
Mortgage and Asset-Backed Securities [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, B Rating [Member]
Ambac Assurance Corporation [Member]
Dec. 31, 2012
Mortgage and Asset-Backed Securities [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, A- Rating [Member]
Financial Guarantee Insurance Corporation [Member]
Dec. 31, 2013
Short-Term [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, CCC+ Rating [Member]
Ambac Assurance Corporation [Member]
Dec. 31, 2013
Short-Term [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, AA- Rating [Member]
Financial Guarantee [Member]
Dec. 31, 2013
Short-Term [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, A Rating [Member]
Assured Guaranty Municipal Corporation [Member]
Dec. 31, 2013
Short-Term [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
MBIA Insurance Corporation [Member]
Dec. 31, 2013
Short-Term [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Assured Guaranty Corporation [Member]
Dec. 31, 2013
Short-Term [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Financial Guarantee Insurance Corporation [Member]
Dec. 31, 2013
Short-Term [Member]
Successor Ambac [Member]
Weighted Average Underlying Rating, BB Rating [Member]
Dec. 31, 2012
Short-Term [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, AA- Rating [Member]
Financial Guarantee [Member]
Dec. 31, 2012
Short-Term [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, A Rating [Member]
Assured Guaranty Municipal Corporation [Member]
Dec. 31, 2012
Short-Term [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
Dec. 31, 2012
Short-Term [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, BBB- Rating [Member]
MBIA Insurance Corporation [Member]
Dec. 31, 2012
Short-Term [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, D Rating [Member]
Assured Guaranty Corporation [Member]
Dec. 31, 2012
Short-Term [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, B Rating [Member]
Ambac Assurance Corporation [Member]
Dec. 31, 2012
Short-Term [Member]
Predecessor Ambac [Member]
Weighted Average Underlying Rating, A- Rating [Member]
Financial Guarantee Insurance Corporation [Member]
Investment [Line Items]                                                                                                                                            
Fair value of securities that include benefit of guarantees provided by financial guarantors $ 1,811,879 $ 570,394 $ 449,555 $ 17,444 $ 2,917 $ 2,869 $ 2,855,058 $ 763,914 $ 622,409 $ 2,859,999 $ 21,876 $ 14,743 $ 1,415,276 $ 21,781 $ 64,596 $ 532,752 $ 372,392          $ 969,740 $ 720,904 $ 448,241 $ 1,253,014       $ 66,270 $ 17,599    $ 37,642 $ 77,163 $ 17,444       $ 132,249 $ 43,010 $ 169,245 $ 236,705 $ 19,733    $ 4,717    $ 1,747,283          $ 2,917 $ 2,869 $ 1,753,069    $ 4,923 $ 1,370,280 $ 2,143 $ 14,743 $ 1,344,289 $ 4,182