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Summary of Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - Recurring - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Assets, fair value | $ 268,098 | $ 780,793
Liabilities: |  |
Liabilities, fair value | 46,495 | 42,044
Money Market Mutual Funds | Cash and Cash Equivalents |  |
Assets: |  |
Assets, fair value | 61,000 | 37,100
Money Market Mutual Funds | Other Assets |  |
Assets: |  |
Assets, fair value | 71,018 | 70,995
Certificates of Deposit | Other Assets |  |
Assets: |  |
Assets, fair value | 2,200 | 2,300
Equity Securities | Other Assets |  |
Assets: |  |
Assets, fair value | 86,539 | 78,367
Term Deposit | Cash and Cash Equivalents |  |
Assets: |  |
Assets, fair value |  | 540,000
Deferred Compensation Assets | Other Assets |  |
Assets: |  |
Assets, fair value | 46,495 | 42,044
Foreign Currency Foreign Exchange Contracts | Other Current Assets |  |
Assets: |  |
Assets, fair value | 846 | 9,987
Deferred Compensation Liability | Other Noncurrent Liabilities |  |
Liabilities: |  |
Liabilities, fair value | 46,495 | 42,044
Basis of Fair Value Measurement, Level 1 |  |
Assets: |  |
Assets, fair value | 265,052 | 228,506
Liabilities: |  |
Liabilities, fair value | 46,495 | 42,044
Basis of Fair Value Measurement, Level 1 | Money Market Mutual Funds | Cash and Cash Equivalents |  |
Assets: |  |
Assets, fair value | 61,000 | 37,100
Basis of Fair Value Measurement, Level 1 | Money Market Mutual Funds | Other Assets |  |
Assets: |  |
Assets, fair value | 71,018 | 70,995
Basis of Fair Value Measurement, Level 1 | Equity Securities | Other Assets |  |
Assets: |  |
Assets, fair value | 86,539 | 78,367
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Assets | Other Assets |  |
Assets: |  |
Assets, fair value | 46,495 | 42,044
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Liability | Other Noncurrent Liabilities |  |
Liabilities: |  |
Liabilities, fair value | 46,495 | 42,044
Basis of Fair Value Measurement, Level 2 |  |
Assets: |  |
Assets, fair value | 3,046 | 552,287
Basis of Fair Value Measurement, Level 2 | Certificates of Deposit | Other Assets |  |
Assets: |  |
Assets, fair value | 2,200 | 2,300
Basis of Fair Value Measurement, Level 2 | Term Deposit | Cash and Cash Equivalents |  |
Assets: |  |
Assets, fair value |  | 540,000
Basis of Fair Value Measurement, Level 2 | Foreign Currency Foreign Exchange Contracts | Other Current Assets |  |
Assets: |  |
Assets, fair value | $ 846 | $ 9,987

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