Quarterly report pursuant to Section 13 or 15(d)

Investments in Marketable Securities - Schedule of Amortized Cost and Fair Value of Marketable Securities, Available-for-Sale, by Contractual Maturity (Detail)

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Investments in Marketable Securities - Schedule of Amortized Cost and Fair Value of Marketable Securities, Available-for-Sale, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost $ 118,744 $ 137,532
Due after one year through five years, Amortized Cost 58,273 61,875
Due after five years through ten years, Amortized Cost 15,941 17,310
Due after ten years, Amortized Cost 4,834 4,737
Amortized Cost 197,792 221,454
Due in one year or less, Fair Value 118,909 137,436
Due after one year through five years, Fair Value 59,002 61,846
Due after five years through ten years, Fair Value 16,451 16,747
Due after ten years, Fair Value 4,876 4,616
Total Fair Value $ 199,238 $ 220,645
Weighted average contractual maturity 1 year 10 months 24 days 1 year 9 months 18 days