Summary of Property, Plant and Equipment Attributed to Significant Countries (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Property, plant and equipment	$ 313,569	$ 186,440	$ 157,021
UNITED STATES
Segment Reporting Information [Line Items]
Property, plant and equipment	222,125	123,846	86,476
KOREA, REPUBLIC OF
Segment Reporting Information [Line Items]
Property, plant and equipment	32,163	4,422	4,946
JAPAN
Segment Reporting Information [Line Items]
Property, plant and equipment	22,261	24,007	27,024
Malaysia
Segment Reporting Information [Line Items]
Property, plant and equipment	20,607	23,801	28,398
All Other Segments
Segment Reporting Information [Line Items]
Property, plant and equipment	$ 16,413	$ 10,364	$ 10,177