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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

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