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Business Segment, Geographic Area, Product and Significant Customer Information - Schedule of Net Revenues and Long-Lived Assets by Geographic Regions (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 554,275	$ 437,153
Long-lived assets	205,990		$ 203,154
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	276,720	218,050
Long-lived assets	127,637		124,689
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	54,011	44,878
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	58,274	37,792
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	101,384	88,243
Long-lived assets	28,787		28,820
Asia (Excluding Korea and Japan) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	63,886	$ 48,190
Long-lived assets	$ 49,566		$ 49,645

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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+ References

No definition available.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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