Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Investment Holdings [Line Items]
Debt securities	$ 23,915	$ 24,320
Equity Securities, FV-NI	37,857	40,949
Total	61,772	65,269
Debt securities, short-term investments	19,403	19,903
Short-term investments	22,303	24,303
Debt securities, long-term investments	4,512	4,417
Long-term investments	39,469	40,966
Certificates of deposit, bonds and other
Investment Holdings [Line Items]
Debt securities	23,915	24,320
Equity Securities, FV-NI	0	0
Total	23,915	24,320
Investments in mutual funds
Investment Holdings [Line Items]
Debt securities	0	0
Equity Securities, FV-NI	37,857	40,949
Total	37,857	40,949
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	2,900	4,400
Long-term Investments
Investment Holdings [Line Items]
Equity Securities, FV-NI, Noncurrent	$ 34,957	$ 36,549

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