Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Debt securities	$ 8,222	$ 8,217
Investments in equity securities	62,256	44,077
Total	70,478	52,294
Debt securities, short-term investments	8,222	8,217
Total, short-term investments	36,701	20,101
Debt securities, long-term investments	0	0
Total, long-term investments	33,777	32,193
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	8,222	8,217
Investments in equity securities	0	0
Total	8,222	8,217
Investments in mutual funds and common stocks
Investment Holdings [Line Items]
Debt securities	0	0
Investments in equity securities	62,256	44,077
Total	62,256	44,077
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	28,479	11,884
Long-term Investments
Investment Holdings [Line Items]
Investments in equity securities	$ 33,777	$ 32,193

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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