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Fair Value Measurements - Available-for-Sale Securities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financial Assets:
Restricted cash	$ 2,400	$ 700
Short-term investments		491
Total available-for-sale securities	92,743	202,839
Equity securities	42,702	35,285
Fair Value, Measurements, Recurring [Member]
Financial Assets:
Cash and cash equivalents	410,691	229,218
Restricted cash	2,400	700
Short-term investments		491
Total available-for-sale securities	92,743	202,839
Equity securities	42,702	35,285
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member]
Financial Assets:
Cash and cash equivalents	410,691	229,218
Restricted cash	2,400	700
Short-term investments		491
Total available-for-sale securities	85,097	193,926
Equity securities	42,702	35,285
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member]
Financial Assets:
Total available-for-sale securities	7,646	8,913
U.S. Treasury and U.S. Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Total available-for-sale securities	11,882	26,295
U.S. Treasury and U.S. Government Agencies [Member] | Fair Value, Measurements, Recurring [Member] | (Level 1) [Member]
Financial Assets:
Total available-for-sale securities	10,144	25,294
U.S. Treasury and U.S. Government Agencies [Member] | Fair Value, Measurements, Recurring [Member] | (Level 2) [Member]
Financial Assets:
Total available-for-sale securities	1,738	1,001
Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Total available-for-sale securities	67,825	159,364
Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member] | (Level 1) [Member]
Financial Assets:
Total available-for-sale securities	67,825	159,364
State, Municipalities, and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Total available-for-sale securities	5,908	7,912
State, Municipalities, and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] | (Level 2) [Member]
Financial Assets:
Total available-for-sale securities	5,908	7,912
Exchange-Traded Debt [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Total available-for-sale securities	7,095	9,145
Exchange-Traded Debt [Member] | Fair Value, Measurements, Recurring [Member] | (Level 1) [Member]
Financial Assets:
Total available-for-sale securities	7,095	9,145
Redeemable Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Financial Assets:
Total available-for-sale securities	33	123
Redeemable Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member] | (Level 1) [Member]
Financial Assets:
Total available-for-sale securities	$ 33	$ 123

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