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Investments - Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Residential Mortgage-Backed Securities [Member]
Dec. 31, 2013
Other Asset-Backed Securities [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Short-Term [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Fixed Income Securities [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Fixed Income Securities [Member]
Municipal Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Fixed Income Securities [Member]
Corporate Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Fixed Income Securities [Member]
U.S. Government Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Fixed Income Securities [Member]
Residential Mortgage-Backed Securities [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Fixed Income Securities [Member]
Collateralized Debt Obligations [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Fixed Income Securities [Member]
Other Asset-Backed Securities [Member]
Dec. 31, 2013
Successor Ambac [Member]
Dec. 31, 2013
Successor Ambac [Member]
Short-Term [Member]
Dec. 31, 2013
Successor Ambac [Member]
Fixed Income Securities [Member]
Dec. 31, 2013
Successor Ambac [Member]
Fixed Income Securities [Member]
Municipal Obligations [Member]
Dec. 31, 2013
Successor Ambac [Member]
Fixed Income Securities [Member]
Corporate Obligations [Member]
Dec. 31, 2013
Successor Ambac [Member]
Fixed Income Securities [Member]
Foreign Obligations [Member]
Dec. 31, 2013
Successor Ambac [Member]
Fixed Income Securities [Member]
U.S. Government Obligations [Member]
Dec. 31, 2013
Successor Ambac [Member]
Fixed Income Securities [Member]
U.S. Agency Obligations [Member]
Dec. 31, 2013
Successor Ambac [Member]
Fixed Income Securities [Member]
Residential Mortgage-Backed Securities [Member]
Dec. 31, 2013
Successor Ambac [Member]
Fixed Income Securities [Member]
Collateralized Debt Obligations [Member]
Dec. 31, 2013
Successor Ambac [Member]
Fixed Income Securities [Member]
Other Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]                                            
Less than 12 Months, Fair Value     $ 228,442 $ 1,194 $ 227,248 $ 42,503 $ 69,727 $ 26,081 $ 88,504 $ 253 $ 180 $ 2,920,966    $ 2,920,966 $ 437,683 $ 877,356 $ 117,905 $ 70,044 $ 5,834 $ 644,502 $ 137,685 $ 629,957
Less than 12 Months, Gross Unrealized Loss 18,105 36,598 7,551    7,551 354 1,081 626 5,319 168 3 116,634    116,634 28,427 23,894 6,901 2,176 70 18,105 463 36,598
12 Months or More, Fair Value         455,626 4,303 132,916    116,146 13,429 188,832                      
12 Months or More, Fair Value     455,626                                       
12 Months or More, Gross Unrealized Loss         70,164 29 8,036    15,236 360 46,503                      
12 Months or More, Gross Unrealized Losses     70,164                                       
Total, Fair Value         682,874 46,806 202,643 26,081 204,650 13,682 189,012                      
Total, Fair Value     684,068 1,194                                    
Total, Gross Unrealized Loss         77,715 383 9,117 626 20,555 528 46,506                      
Total, Gross Unrealized Loss     $ 77,715