Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investment Holdings [Line Items]
Debt securities	$ 58,341	$ 82,879
Investments in equity securities	36,144	39,143
Equity Securities, FV-NI	36,144	39,143
Total	94,485	122,022
Debt securities, short-term investments	43,338	67,872
Short-term investments	49,965	77,693
Debt securities, long-term investments	15,003	15,007
Long-term investments	44,520	44,329
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	58,341	82,879
Investments in equity securities	0	0
Total	58,341	82,879
Investments in mutual funds and common stocks
Investment Holdings [Line Items]
Debt securities	0	0
Investments in equity securities	36,144	39,143
Total	36,144	39,143
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	6,627	9,821
Long-term Investments
Investment Holdings [Line Items]
Equity Securities, FV-NI, Noncurrent	$ 29,517	$ 29,322

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