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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 | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 203,021 us-gaap_SalesRevenueNet | $ 186,798 us-gaap_SalesRevenueNet | $ 184,697 us-gaap_SalesRevenueNet | $ 206,353 us-gaap_SalesRevenueNet | $ 204,394 us-gaap_SalesRevenueNet | $ 166,453 us-gaap_SalesRevenueNet | $ 156,928 us-gaap_SalesRevenueNet | $ 141,645 us-gaap_SalesRevenueNet | $ 780,869 us-gaap_SalesRevenueNet | $ 669,420 us-gaap_SalesRevenueNet | $ 643,508 us-gaap_SalesRevenueNet
Long-lived assets | 74,687 us-gaap_NoncurrentAssets |  |  |  | 79,659 us-gaap_NoncurrentAssets |  |  |  | 74,687 us-gaap_NoncurrentAssets | 79,659 us-gaap_NoncurrentAssets |
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 448,452 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 363,948 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 326,894 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Long-lived assets | 57,701 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 60,700 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 57,701 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 60,700 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |
Korea [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 97,323 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR | 75,401 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR | 64,541 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KR
Japan [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 61,092 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 56,978 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP | 81,883 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_JP
Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 80,659 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 77,910 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 85,362 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Long-lived assets | 6,099 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |  |  |  | 5,484 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |  |  |  | 6,099 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 5,484 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |
Asia (Excluding Korea and Japan) [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 93,343 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember | 95,183 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember | 84,828 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Long-lived assets | $ 10,887 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember |  |  |  | $ 13,475 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember |  |  |  | $ 10,887 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember | $ 13,475 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember |

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