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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 186,798	$ 166,453	$ 577,848	$ 465,026
Long-lived assets	75,654		75,654		79,659
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	107,583	91,286	332,892	252,704
Long-lived assets	57,560		57,560		60,700
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	20,540	19,012	70,806	52,224
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	14,798	13,825	46,141	40,243
Asia (excluding Korea and Japan) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	22,539	21,897	68,304	61,897
Long-lived assets	12,019		12,019		13,475
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	21,338	20,433	59,705	57,958
Long-lived assets	$ 6,075		$ 6,075		$ 5,484