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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 124,808
Due after one year through five years	400,137
Due after five years through ten years	278,719
Due after ten years	14,639
Perpetual maturity securities	863
Amortized Cost	819,166	$ 828,336
Fair Value
Due in one year or less	125,912
Due after one year through five years	420,146
Due after five years through ten years	308,072
Due after ten years	14,403
Perpetual maturity securities	885
Fair Value	$ 869,418	$ 855,284

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