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Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity (Detail) (Successor Ambac [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost, Due in one year or less $ 552,974
Amortized Cost, Due after one year through five years 1,079,855
Amortized Cost, Due after five years through ten years 1,385,296
Amortized Cost, Due after ten years 585,197
Amortized Cost, Total 3,603,322
Amortized Cost 6,324,568
Estimated Fair Value, Due in one year or less 553,048
Estimated Fair Value, Due after one year through five years 1,075,612
Estimated Fair Value, Due after five years through ten years 1,343,119
Estimated Fair Value, Due after ten years 575,934
Estimated Fair Value due, Total 3,547,713
Estimated Fair Value 6,282,658
Residential Mortgage-Backed Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 1,516,877
Estimated Fair Value 1,558,625
Collateralized Debt Obligations [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 184,118
Estimated Fair Value 183,872
Other Asset-Backed Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 1,020,251
Estimated Fair Value $ 992,448