Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Held to maturity	$ 2,235	$ 2,235
Held to maturity, short-term investments	2,235	2,235
Held to maturity, long-term investments	0	0
Equity Securities, FV-NI	36,214	36,124
Total	38,449	38,359
Total, short-term investments	4,035	2,935
Total, long-term investments	34,414	35,424
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Held to maturity	2,235	2,235
Equity Securities, FV-NI	0	0
Total	2,235	2,235
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Held to maturity	0	0
Equity Securities, FV-NI	36,214	36,124
Total	36,214	36,124
Short-term Investments
Investment Holdings [Line Items]
Equity Securities, FV-NI	1,800	700
Long-term Investments
Investment Holdings [Line Items]
Equity Securities, FV-NI	$ 34,414	$ 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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