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Summary of Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - Recurring - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Assets, fair value | $ 209,248 | $ 780,793
Liabilities: |  |
Liabilities, fair value | 44,019 | 42,044
Money Market Mutual Funds | Cash and Cash Equivalents |  |
Assets: |  |
Assets, fair value | 13,900 | 37,100
Money Market Mutual Funds | Other Assets |  |
Assets: |  |
Assets, fair value | 71,012 | 70,995
Certificates of Deposit | Other Assets |  |
Assets: |  |
Assets, fair value | 2,200 | 2,300
Equity Securities | Other Assets |  |
Assets: |  |
Assets, fair value | 77,675 | 78,367
Term Deposit | Cash and Cash Equivalents |  |
Assets: |  |
Assets, fair value |  | 540,000
Deferred Compensation Assets | Other Assets |  |
Assets: |  |
Assets, fair value | 44,019 | 42,044
Foreign Currency Foreign Exchange Contracts | Other Current Assets |  |
Assets: |  |
Assets, fair value | 442 | 9,987
Deferred Compensation Liability | Other Noncurrent Liabilities |  |
Liabilities: |  |
Liabilities, fair value | 44,019 | 42,044
Basis of Fair Value Measurement, Level 1 |  |
Assets: |  |
Assets, fair value | 206,606 | 228,506
Liabilities: |  |
Liabilities, fair value | 44,019 | 42,044
Basis of Fair Value Measurement, Level 1 | Money Market Mutual Funds | Cash and Cash Equivalents |  |
Assets: |  |
Assets, fair value | 13,900 | 37,100
Basis of Fair Value Measurement, Level 1 | Money Market Mutual Funds | Other Assets |  |
Assets: |  |
Assets, fair value | 71,012 | 70,995
Basis of Fair Value Measurement, Level 1 | Equity Securities | Other Assets |  |
Assets: |  |
Assets, fair value | 77,675 | 78,367
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Assets | Other Assets |  |
Assets: |  |
Assets, fair value | 44,019 | 42,044
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Liability | Other Noncurrent Liabilities |  |
Liabilities: |  |
Liabilities, fair value | 44,019 | 42,044
Basis of Fair Value Measurement, Level 2 |  |
Assets: |  |
Assets, fair value | 2,642 | 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 | $ 442 | $ 9,987

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