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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 125,392
Due after one year through five years	430,647
Due after five years through ten years	296,314
Due after ten years	9,515
Perpetual maturity securities	1,153
Amortized Cost	863,021	$ 831,127
Fair Value
Due in one year or less	125,260
Due after one year through five years	437,007
Due after five years through ten years	310,958
Due after ten years	9,656
Perpetual maturity securities	1,212
Fair Value	$ 884,093	$ 820,438

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