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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) $ in Thousands	Mar. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost, Due in one year or less	$ 1,076,361
Amortized Cost, Due after one year through five years	999,235
Amortized Cost, Due after five years through ten years	316,441
Amortized Cost, Due after ten years	360,555
Amortized Cost, Total	2,752,592
Estimated Fair Value, Due in one year or less	1,076,545
Estimated Fair Value, Due after one year through five years	1,006,812
Estimated Fair Value, Due after five years through ten years	323,494
Estimated Fair Value, Due after ten years	375,434
Estimated Fair Value due, Total	$ 2,782,285

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