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Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Investment Holdings [Line Items]
Debt securities	$ 31,783	$ 44,158
Equity Securities, FV-NI	37,953	40,566
Total	69,736	84,724
Debt securities, short-term investments	28,114	44,158
Short-term investments	31,014	51,064
Debt securities, long-term investments	3,669	0
Long-term investments	38,722	33,660
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	31,783	44,158
Equity Securities, FV-NI	0	0
Total	31,783	44,158
Investments in mutual funds and common stocks
Investment Holdings [Line Items]
Debt securities	0	0
Equity Securities, FV-NI	37,953	40,566
Total	37,953	40,566
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	2,900	6,906
Long-term Investments
Investment Holdings [Line Items]
Equity Securities, FV-NI, Noncurrent	$ 35,053	$ 33,660

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