Fair Value Measurements - Available-for-Sale Securities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial Assets:
Restricted cash	$ 2,600	$ 2,400
Debt Securities, Available-for-sale	398,571	42,583
Equity Securities, FV-NI, Current	35,719	51,740
Fair Value, Measurements, Recurring [Member]
Financial Assets:
Cash and cash equivalents	360,488	628,943
Restricted cash	2,600	2,400
Debt Securities, Available-for-sale	398,571	42,583
Equity Securities, FV-NI, Current	35,719	51,740
Fair Value, Measurements, Recurring [Member] \| (Level 1) [Member]
Financial Assets:
Cash and cash equivalents	360,488	628,943
Restricted cash	2,600	2,400
Debt Securities, Available-for-sale	395,375	39,287
Equity Securities, FV-NI, Current	35,719	51,740
Fair Value, Measurements, Recurring [Member] \| (Level 2) [Member]
Financial Assets:
Debt Securities, Available-for-sale	3,196	3,296
U.S. Treasury and U.S. Government Agencies [Member] \| Fair Value, Measurements, Recurring [Member]
Financial Assets:
Debt Securities, Available-for-sale	367,563	17,024
U.S. Treasury and U.S. Government Agencies [Member] \| Fair Value, Measurements, Recurring [Member] \| (Level 1) [Member]
Financial Assets:
Debt Securities, Available-for-sale	366,134	15,536
U.S. Treasury and U.S. Government Agencies [Member] \| Fair Value, Measurements, Recurring [Member] \| (Level 2) [Member]
Financial Assets:
Debt Securities, Available-for-sale	1,429	1,488
Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member]
Financial Assets:
Debt Securities, Available-for-sale	28,424	22,492
Corporate Bonds [Member] \| Fair Value, Measurements, Recurring [Member] \| (Level 1) [Member]
Financial Assets:
Debt Securities, Available-for-sale	28,424	22,492
State, Municipalities, and Political Subdivisions [Member] \| Fair Value, Measurements, Recurring [Member]
Financial Assets:
Debt Securities, Available-for-sale	1,767	1,808
State, Municipalities, and Political Subdivisions [Member] \| Fair Value, Measurements, Recurring [Member] \| (Level 2) [Member]
Financial Assets:
Debt Securities, Available-for-sale	1,767	1,808
Exchange-Traded Debt [Member] \| Fair Value, Measurements, Recurring [Member]
Financial Assets:
Debt Securities, Available-for-sale	713	811
Exchange-Traded Debt [Member] \| Fair Value, Measurements, Recurring [Member] \| (Level 1) [Member]
Financial Assets:
Debt Securities, Available-for-sale	713	811
Redeemable Preferred Stock [Member] \| Fair Value, Measurements, Recurring [Member]
Financial Assets:
Debt Securities, Available-for-sale	104	448
Redeemable Preferred Stock [Member] \| Fair Value, Measurements, Recurring [Member] \| (Level 1) [Member]
Financial Assets:
Debt Securities, Available-for-sale	$ 104	$ 448

Disclosure fair value of financial assets.

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Amount of 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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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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