Amortized Costs and Fair Value of Available-for-sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Costs	$ 43,899	$ 130,936
Available-for-sale securities, Gross Unrealized Gains	169	662
Available-for-sale securities, Gross Unrealized Losses	(5)	(654)
Available-for-sale securities, Fair Value	44,063	130,944
Available-for-sale securities, Less than 12 months, Fair Value	44,063	130,944
Available-for-sale securities, Less than 12 months, Unrealized Losses	(5)	(654)
Available-for-sale securities, 12 months or more, Fair Value	0	0
Available-for-sale securities, 12 months or more, Unrealized Losses	0	0
Total, Fair Value	44,063	130,944
Total, Unrealized Losses	(5)	(654)
Certificates of deposit (foreign)
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Costs	12,644	87,372
Available-for-sale securities, Fair Value	12,644	87,372
Available-for-sale securities, Less than 12 months, Fair Value	12,644	87,372
Available-for-sale securities, 12 months or more, Fair Value	0	0
Available-for-sale securities, 12 months or more, Unrealized Losses	0	0
Total, Fair Value	12,644	87,372
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Costs	26,096	34,175
Available-for-sale securities, Gross Unrealized Gains	21	35
Available-for-sale securities, Gross Unrealized Losses	(5)	(77)
Available-for-sale securities, Fair Value	26,112	34,133
Available-for-sale securities, Less than 12 months, Fair Value	26,112	34,133
Available-for-sale securities, Less than 12 months, Unrealized Losses	(5)	(77)
Available-for-sale securities, 12 months or more, Fair Value	0	0
Available-for-sale securities, 12 months or more, Unrealized Losses	0	0
Total, Fair Value	26,112	34,133
Total, Unrealized Losses	(5)	(77)
Short-term bond fund
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Costs		5,046
Available-for-sale securities, Gross Unrealized Gains		69
Available-for-sale securities, Gross Unrealized Losses		(69)
Available-for-sale securities, Fair Value		5,046
Available-for-sale securities, Less than 12 months, Fair Value		5,046
Available-for-sale securities, Less than 12 months, Unrealized Losses		(69)
Available-for-sale securities, 12 months or more, Fair Value	0	0
Available-for-sale securities, 12 months or more, Unrealized Losses	0	0
Total, Fair Value		5,046
Total, Unrealized Losses		(69)
Corporate obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Costs	4	3
Available-for-sale securities, Fair Value	4	3
Available-for-sale securities, Less than 12 months, Fair Value	4	3
Available-for-sale securities, 12 months or more, Fair Value	0	0
Available-for-sale securities, 12 months or more, Unrealized Losses	0	0
Total, Fair Value	4	3
Money markets
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Costs	54	54
Available-for-sale securities, Fair Value	54	54
Available-for-sale securities, Less than 12 months, Fair Value	54	54
Available-for-sale securities, 12 months or more, Fair Value	0	0
Available-for-sale securities, 12 months or more, Unrealized Losses	0	0
Total, Fair Value	54	54
Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Costs	108	94
Available-for-sale securities, Gross Unrealized Gains	3	28
Available-for-sale securities, Gross Unrealized Losses		(21)
Available-for-sale securities, Fair Value	111	101
Available-for-sale securities, Less than 12 months, Fair Value	111	101
Available-for-sale securities, Less than 12 months, Unrealized Losses		(21)
Available-for-sale securities, 12 months or more, Fair Value	0	0
Available-for-sale securities, 12 months or more, Unrealized Losses	0	0
Total, Fair Value	111	101
Total, Unrealized Losses		(21)
Other investments
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized Costs	4,993	4,192
Available-for-sale securities, Gross Unrealized Gains	145	530
Available-for-sale securities, Gross Unrealized Losses		(487)
Available-for-sale securities, Fair Value	5,138	4,235
Available-for-sale securities, Less than 12 months, Fair Value	5,138	4,235
Available-for-sale securities, Less than 12 months, Unrealized Losses		(487)
Available-for-sale securities, 12 months or more, Fair Value	0	0
Available-for-sale securities, 12 months or more, Unrealized Losses	0	0
Total, Fair Value	$ 5,138	4,235
Total, Unrealized Losses		$ (487)

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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