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
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost $ 134,460 $ 158,148
Due after one year through five years, Amortized Cost 50,401 30,604
Due after five years through ten years, Amortized Cost 10,323 10,022
Due after ten years, Amortized Cost 4,390 4,555
Amortized Cost 199,574 203,329
Due in one year or less, Fair Value 134,494 158,258
Due after one year through five years, Fair Value 51,534 32,041
Due after five years through ten years, Fair Value 10,891 11,044
Due after ten years, Fair Value 4,506 4,688
Total Fair Value $ 201,425 $ 206,031
Weighted average contractual maturity 1 year 8 months 12 days 1 year 7 months 6 days