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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 75,023
Due after one year through five years	469,895
Due after five years through ten years	235,351
Due after ten years	58,212
Perpetual maturity securities	2,165
Amortized Cost	840,646	$ 828,336
Fair Value
Due in one year or less	75,416
Due after one year through five years	471,884
Due after five years through ten years	235,383
Due after ten years	57,709
Perpetual maturity securities	2,182
Fair Value	$ 842,574	$ 855,284

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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