Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Held to maturity	$ 3,113	$ 2,235
Held to maturity, short-term investments	3,113	2,235
Held to maturity, long-term investments	0	0
Equity Securities, FV-NI	37,151	36,124
Total	40,264	38,359
Total, short-term investments	5,213	2,935
Total, long-term investments	35,051	35,424
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Held to maturity	3,113	2,235
Equity Securities, FV-NI	0	0
Total	3,113	2,235
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Held to maturity	0	0
Equity Securities, FV-NI	37,151	36,124
Total	37,151	36,124
Short-term Investments
Investment Holdings [Line Items]
Equity Securities, FV-NI	2,100	700
Long-term Investments
Investment Holdings [Line Items]
Equity Securities, FV-NI	$ 35,051	$ 35,424

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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