Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Investment Holdings [Line Items]
Debt securities	$ 16,414	$ 24,320
Equity Securities, FV-NI	41,865	40,949
Total	58,279	65,269
Debt securities, short-term investments	16,414	19,903
Short-term investments	19,914	24,303
Debt securities, long-term investments	0	4,417
Long-term investments	38,365	40,966
Certificates of deposit, bonds and other
Investment Holdings [Line Items]
Debt securities	16,414	24,320
Equity Securities, FV-NI	0	0
Total	16,414	24,320
Investments in mutual funds
Investment Holdings [Line Items]
Debt securities	0	0
Equity Securities, FV-NI	41,865	40,949
Total	41,865	40,949
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	3,500	4,400
Long-term Investments
Investment Holdings [Line Items]
Equity Securities, FV-NI, Noncurrent	$ 38,365	$ 36,549

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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