Short-Term and Long-Term Investments - Additional Information (Detail) - USD ($)	3 Months Ended
Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Unrealized Losses On Short Term And Long Term Investments [Line Items]
Short Term Investments	$ 95,719,000	$ 50,166,000
Minimum period for which failed auction securities been in unrealized loss position	12 months
Failed Auction Security [Member]
Unrealized Losses On Short Term And Long Term Investments [Line Items]
Amortized cost of securities	$ 3,000,000	3,000,000
Period for which failed auction securities been in unrealized loss position	exceeds 12 months
Estimated Fair Value	$ 2,541,000	2,517,000
Gross Unrealized Losses	459,000	483,000
Aggregate credit loss	32,000	$ 33,000	$ 36,000	$ 37,000
Aggregate temporary impairment loss	$ 427,000

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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Unrealized Losses On Short Term And Long Term Investments [Line Items]

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