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Interest Income and Other (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Interest income									$ 5,448	$ 3,968	$ 4,420
Foreign exchange transaction gains (losses), net									261	(77)	4,937
Other									(732)	(139)	1,109
Total	$ 2,903	$ 1,400	$ 2,474	$ (1,800)	$ 452	$ 1,103	$ 1,592	$ 605	$ 4,977	$ 3,752	$ 10,466

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Interest and Other Income (Expense), Net

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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The net amount of operating interest income (expense).

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Amount of income (expense) related to nonoperating activities, classified as other.

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