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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]
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column E -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph Column C -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column C -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column C.3,4) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column C.7) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column E.2,3) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.Column C.6) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611282-123010 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column C -Article 12 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph 3, 4 -Article 12 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph 2, 3 -Article 12 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph 6 -Article 12 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph 7 -Article 12 + Details
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