Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Investment Holdings [Line Items]
Debt securities	$ 68,863	$ 44,158
Investments in equity securities	35,746	40,566
Equity Securities, FV-NI	35,746	40,566
Total	104,609	84,724
Debt securities, short-term investments	68,863	44,158
Short-term investments	73,163	51,064
Debt securities, long-term investments	0	0
Long-term investments	31,446	33,660
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	68,863	44,158
Investments in equity securities	0	0
Total	68,863	44,158
Investments in mutual funds and common stocks
Investment Holdings [Line Items]
Debt securities	0	0
Investments in equity securities	35,746	40,566
Total	35,746	40,566
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	4,300	6,906
Long-term Investments
Investment Holdings [Line Items]
Equity Securities, FV-NI, Noncurrent	$ 31,446	$ 33,660

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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