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Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Debt securities	$ 8,225	$ 8,217
Investments in equity securities	52,063	44,077
Total	60,288	52,294
Debt securities, short-term investments	8,225	8,217
Total, short-term investments	26,690	20,101
Debt securities, long-term investments	0	0
Total, long-term investments	33,598	32,193
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	8,225	8,217
Investments in equity securities	0	0
Total	8,225	8,217
Investments in mutual funds and common stocks
Investment Holdings [Line Items]
Debt securities	0	0
Investments in equity securities	52,063	44,077
Total	52,063	44,077
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	18,465	11,884
Long-term Investments
Investment Holdings [Line Items]
Investments in equity securities	$ 33,598	$ 32,193

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