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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, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 213,839us-gaap_SalesRevenueNet	$ 206,353us-gaap_SalesRevenueNet
Long-lived assets	73,030us-gaap_NoncurrentAssets		74,687us-gaap_NoncurrentAssets
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	120,181us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	117,377us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Long-lived assets	57,337us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US		57,701us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	32,072us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR	27,591us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	17,256us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP	16,928us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP
Asia (Excluding Korea and Japan) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	23,683us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember	24,902us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Long-lived assets	10,162us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember		10,887us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	20,647us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	19,555us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Long-lived assets	$ 5,531us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember		$ 6,099us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember

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=6534315&loc=d3e9038-108599

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X

- Definition

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=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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