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Investments - Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Ambac Wrapped Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments $ 36,995  
Successor [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 1,477,139 $ 1,491,493
Less than 12 Months, Gross Unrealized Loss 22,796 29,944
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 639,343 788,764
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 45,769 49,698
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2,116,482 2,280,257
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 68,565 79,642
Successor [Member] | Below Investment Grade Securities and Non-Rated Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Below Investment Grade Securities And Non Rated Securities Continuous Unrealized Loss Position Fair Value 985,032 890,952
Below Investment Grade Securities And Non Rated Securities Continuous Unrealized Loss Position Aggregate Losses 48,888 53,273
Successor [Member] | Short-Term [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 126,441 65,176
Less than 12 Months, Gross Unrealized Loss 109 44
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 126,441 65,176
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 109 44
Fixed Income Investments And Other Investments [Member] | Successor [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 68,565 79,642
Fixed Income Securities [Member] | Successor [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 1,350,698 1,426,317
Less than 12 Months, Gross Unrealized Loss 22,687 29,900
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 639,343 788,764
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 45,769 49,698
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,990,041 2,215,081
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 68,456 79,598
Fixed Income Securities [Member] | Successor [Member] | Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 140,215 98,147
Less than 12 Months, Gross Unrealized Loss 2,633 2,045
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 109,137 122,928
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4,951 5,160
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 249,352 221,075
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 7,584 7,205
Fixed Income Securities [Member] | Successor [Member] | Corporate Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 756,173 963,513
Less than 12 Months, Gross Unrealized Loss 15,149 20,232
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,937 6,492
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 154 328
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 760,110 970,005
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 15,303 20,560
Fixed Income Securities [Member] | Successor [Member] | U.S. Government Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 10,615 6,037
Less than 12 Months, Gross Unrealized Loss 103 93
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 5,021 5,045
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4 4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 15,636 11,082
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 107 97
Fixed Income Securities [Member] | Successor [Member] | U.S. Agency Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 4,018 4,060
Less than 12 Months, Gross Unrealized Loss 2 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,018 4,060
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 2 3
Fixed Income Securities [Member] | Successor [Member] | Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 280,529 226,889
Less than 12 Months, Gross Unrealized Loss 4,081 7,201
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 442,162 550,807
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 33,178 36,584
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 722,691 777,696
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 37,259 43,785
Fixed Income Securities [Member] | Successor [Member] | Collateralized Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 23,149 6,986
Less than 12 Months, Gross Unrealized Loss 2 23
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 8,005 25,780
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2 197
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 31,154 32,766
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 4 220
Fixed Income Securities [Member] | Successor [Member] | Other Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 132,395 115,622
Less than 12 Months, Gross Unrealized Loss 685 203
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 71,081 77,712
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 7,480 7,425
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 203,476 193,334
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 8,165 7,628
Fixed Income Securities [Member] | Successor [Member] | Foreign Government Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 3,604 5,063
Less than 12 Months, Gross Unrealized Loss 32 100
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 3,604 5,063
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 32 100
Securities Pledged as Collateral [Member] | Fixed Income Securities [Member] | Successor [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 0 0
Securities Pledged as Collateral [Member] | Fixed Income Securities [Member] | Successor [Member] | U.S. Government Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments $ 0 $ 0