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Investments in debt and equity securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |
Debt securities | $ 104,837 | $ 23,226
Investments in equity securities | 40,214 | 48,598
Total | 145,051 | 71,824
Debt securities, short-term investments | 89,830 | 8,227
Total, short-term investments | 100,489 | 22,310
Debt securities, long-term investments | 15,007 | 14,999
Total, long-term investments | 44,562 | 49,514
Certificates of deposit and other time deposits |  |
Investment Holdings [Line Items] |  |
Debt securities | 104,837 | 23,226
Investments in equity securities | 0 | 0
Total | 104,837 | 23,226
Investments in mutual funds and common stocks |  |
Investment Holdings [Line Items] |  |
Debt securities | 0 | 0
Investments in equity securities | 40,214 | 48,598
Total | 40,214 | 48,598
Short-term Investments |  |
Investment Holdings [Line Items] |  |
Investments in equity securities | 10,659 | 14,083
Long-term Investments |  |
Investment Holdings [Line Items] |  |
Investments in equity securities | $ 29,555 | $ 34,515

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