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Investments in debt and equity securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Held to maturity	$ 2,228	$ 31,630
Equity Securities, FV-NI	36,500
Available for sale		38,895
Total	38,728	70,525
Held to maturity, short-term investments	2,228	31,630
Available for sale, short-term investments		1,200
Total, short-term investments	4,528	32,830
Held to maturity, long-term investments	0	0
Available for sale, long-term investments		37,695
Total, long-term investments	34,200	37,695
Certificates of deposit and other time deposits
Investment Holdings [Line Items]
Held to maturity	2,228	31,630
Equity Securities, FV-NI	0
Available for sale, equity securities		0
Total	2,228	31,630
Investments in mutual funds and common stock
Investment Holdings [Line Items]
Held to maturity	0	0
Equity Securities, FV-NI	36,500
Available for sale, equity securities		38,895
Total	36,500	$ 38,895
Short-term Investments [Member]
Investment Holdings [Line Items]
Equity Securities, FV-NI	2,300
Other Long-term Investments [Member]
Investment Holdings [Line Items]
Equity Securities, FV-NI	$ 34,200

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