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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 102,098
Due after one year through five years	402,877
Due after five years through ten years	319,707
Due after ten years	8,940
Perpetual maturity securities	1,195
Amortized Cost	834,817	$ 831,127
Fair Value
Due in one year or less	101,753
Due after one year through five years	403,320
Due after five years through ten years	325,217
Due after ten years	8,507
Perpetual maturity securities	1,231
Fair Value	$ 840,028

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