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

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