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Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Debt securities	$ 8,212	$ 8,140
Investments in equity securities	41,015	39,951
Total	49,227	48,091
Debt securities, short-term investments	8,212	8,140
Total, short-term investments	19,360	11,572
Debt securities, long-term investments	0	0
Total, long-term investments	29,867	36,519
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	8,212	8,140
Investments in equity securities	0	0
Total	8,212	8,140
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Debt securities	0	0
Investments in equity securities	41,015	39,951
Total	41,015	39,951
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	11,148	3,432
Long-term Investments
Investment Holdings [Line Items]
Investments in equity securities	$ 29,867	$ 36,519

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

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