Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Investment Holdings [Line Items]
Debt securities	$ 15,296	$ 22,109
Investments in equity securities	39,544	37,391
Equity Securities, FV-NI	39,544	37,391
Total	54,840	59,500
Debt securities, short-term investments	15,296	7,110
Short-term investments	20,996	11,610
Debt securities, long-term investments	0	14,999
Long-term investments	33,844	47,890
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	15,296	22,109
Investments in equity securities	0	0
Total	15,296	22,109
Investments in mutual funds and common stocks
Investment Holdings [Line Items]
Debt securities	0	0
Investments in equity securities	39,544	37,391
Total	39,544	37,391
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	5,700	4,500
Long-term Investments
Investment Holdings [Line Items]
Equity Securities, FV-NI, Noncurrent	$ 33,844	$ 32,891

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as noncurrent.

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