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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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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