Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost $ 150,517 $ 137,532
Due after one year through five years, Amortized Cost 41,123 61,875
Due after five years through ten years, Amortized Cost 12,813 17,310
Due after ten years, Amortized Cost 5,532 4,737
Amortized Cost 209,985 221,454
Due in one year or less, Fair Value 150,752 137,436
Due after one year through five years, Fair Value 41,794 61,846
Due after five years through ten years, Fair Value 13,467 16,747
Due after ten years, Fair Value 5,548 4,616
Total Fair Value $ 211,561 $ 220,645
Weighted average contractual maturity 1 year 8 months 12 days 1 year 9 months 18 days