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Investments in debt and equity securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |
Debt securities | $ 143,059 | $ 8,140
Investments in equity securities | 39,396 | 39,951
Total | 182,455 | 48,091
Debt securities, short-term investments | 143,059 | 8,140
Total, short-term investments | 154,115 | 11,572
Debt securities, long-term investments | 0 | 0
Total, long-term investments | 28,340 | 36,519
Certificates of deposit and other time deposits |  |
Investment Holdings [Line Items] |  |
Debt securities | 143,059 | 8,140
Investments in equity securities | 0 | 0
Total | 143,059 | 8,140
Investments in mutual funds and common stock |  |
Investment Holdings [Line Items] |  |
Debt securities | 0 | 0
Investments in equity securities | 39,396 | 39,951
Total | 39,396 | 39,951
Short-term Investments |  |
Investment Holdings [Line Items] |  |
Investments in equity securities | 11,056 | 3,432
Long-term Investments |  |
Investment Holdings [Line Items] |  |
Investments in equity securities | $ 28,340 | $ 36,519

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