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Summary of Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - Recurring - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Assets, fair value | $ 780,793 | $ 178,706
Liabilities: |  |
Liabilities, fair value | 42,044 | 35,510
Term Deposit | Cash and Cash Equivalents |  |
Assets: |  |
Assets, fair value | 540,000 |
Money Market Mutual Funds | Cash and Cash Equivalents |  |
Assets: |  |
Assets, fair value | 37,100 |
Money Market Mutual Funds | Other Assets |  |
Assets: |  |
Assets, fair value | 70,995 | 60,175
Certificates of Deposit | Other Assets |  |
Assets: |  |
Assets, fair value | 2,300 | 2,200
Available for Sale Securities | Other Assets |  |
Assets: |  |
Assets, fair value | 78,367 | 70,478
Deferred Compensation Assets | Other Assets |  |
Assets: |  |
Assets, fair value | 42,044 | 35,510
Foreign Currency Foreign Exchange Contracts | Other Current Assets |  |
Assets: |  |
Assets, fair value | 9,987 | 10,343
Deferred Compensation Liability | Other Noncurrent Liabilities |  |
Liabilities: |  |
Liabilities, fair value | 42,044 | 35,510
Basis of Fair Value Measurement, Level 1 |  |
Assets: |  |
Assets, fair value | 228,506 | 166,163
Liabilities: |  |
Liabilities, fair value | 42,044 | 35,510
Basis of Fair Value Measurement, Level 1 | Money Market Mutual Funds | Cash and Cash Equivalents |  |
Assets: |  |
Assets, fair value | 37,100 |
Basis of Fair Value Measurement, Level 1 | Money Market Mutual Funds | Other Assets |  |
Assets: |  |
Assets, fair value | 70,995 | 60,175
Basis of Fair Value Measurement, Level 1 | Available for Sale Securities | Other Assets |  |
Assets: |  |
Assets, fair value | 78,367 | 70,478
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Assets | Other Assets |  |
Assets: |  |
Assets, fair value | 42,044 | 35,510
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Liability | Other Noncurrent Liabilities |  |
Liabilities: |  |
Liabilities, fair value | 42,044 | 35,510
Basis of Fair Value Measurement, Level 2 |  |
Assets: |  |
Assets, fair value | 552,287 | 12,543
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 | Certificates of Deposit | Other Assets |  |
Assets: |  |
Assets, fair value | 2,300 | 2,200
Basis of Fair Value Measurement, Level 2 | Foreign Currency Foreign Exchange Contracts | Other Current Assets |  |
Assets: |  |
Assets, fair value | $ 9,987 | $ 10,343

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