Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Debt securities	$ 23,230	$ 23,226
Investments in equity securities	44,043	48,598
Total	67,273	71,824
Debt securities, short-term investments	8,228	8,227
Total, short-term investments	19,407	22,310
Debt securities, long-term investments	15,002	14,999
Total, long-term investments	47,866	49,514
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	23,230	23,226
Investments in equity securities	0	0
Total	23,230	23,226
Investments in mutual funds and common stocks
Investment Holdings [Line Items]
Debt securities	0	0
Investments in equity securities	44,043	48,598
Total	44,043	48,598
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	11,179	14,083
Long-term Investments
Investment Holdings [Line Items]
Investments in equity securities	$ 32,864	$ 34,515

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

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