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Investments in debt and equity securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Investment Holdings [Line Items] |  |
Debt securities | $ 8,225 | $ 8,217
Investments in equity securities | 52,063 | 44,077
Total | 60,288 | 52,294
Debt securities, short-term investments | 8,225 | 8,217
Total, short-term investments | 26,690 | 20,101
Debt securities, long-term investments | 0 | 0
Total, long-term investments | 33,598 | 32,193
Certificates of deposit and other time deposits |  |
Investment Holdings [Line Items] |  |
Debt securities | 8,225 | 8,217
Investments in equity securities | 0 | 0
Total | 8,225 | 8,217
Investments in mutual funds and common stocks |  |
Investment Holdings [Line Items] |  |
Debt securities | 0 | 0
Investments in equity securities | 52,063 | 44,077
Total | 52,063 | 44,077
Short-term Investments |  |
Investment Holdings [Line Items] |  |
Investments in equity securities | 18,465 | 11,884
Long-term Investments |  |
Investment Holdings [Line Items] |  |
Investments in equity securities | $ 33,598 | $ 32,193

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