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Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Debt securities	$ 104,837	$ 23,226
Investments in equity securities	40,214	48,598
Total	145,051	71,824
Debt securities, short-term investments	89,830	8,227
Total, short-term investments	100,489	22,310
Debt securities, long-term investments	15,007	14,999
Total, long-term investments	44,562	49,514
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	104,837	23,226
Investments in equity securities	0	0
Total	104,837	23,226
Investments in mutual funds and common stocks
Investment Holdings [Line Items]
Debt securities	0	0
Investments in equity securities	40,214	48,598
Total	40,214	48,598
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	10,659	14,083
Long-term Investments
Investment Holdings [Line Items]
Investments in equity securities	$ 29,555	$ 34,515

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