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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 122,700
Due after one year through five years	427,470
Due after five years through ten years	288,021
Due after ten years	12,040
Perpetual maturity securities	427
Amortized Cost	850,658	$ 831,127
Fair Value
Due in one year or less	122,907
Due after one year through five years	436,026
Due after five years through ten years	306,986
Due after ten years	12,173
Perpetual maturity securities	475
Fair Value	$ 878,567	$ 820,438

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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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