Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Debt securities	$ 143,059	$ 8,140
Investments in equity securities	39,396	39,951
Total	182,455	48,091
Debt securities, short-term investments	143,059	8,140
Total, short-term investments	154,115	11,572
Debt securities, long-term investments	0	0
Total, long-term investments	28,340	36,519
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Debt securities	143,059	8,140
Investments in equity securities	0	0
Total	143,059	8,140
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Debt securities	0	0
Investments in equity securities	39,396	39,951
Total	39,396	39,951
Short-term Investments
Investment Holdings [Line Items]
Investments in equity securities	11,056	3,432
Long-term Investments
Investment Holdings [Line Items]
Investments in equity securities	$ 28,340	$ 36,519

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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