Summary of Total Net Sales to External Customers (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 350,562	$ 345,591	$ 329,002	$ 317,377	$ 308,502	$ 296,692	$ 303,052	$ 267,024	$ 1,342,532	$ 1,175,270	$ 1,081,121
TAIWAN, PROVINCE OF CHINA
Segment Reporting Information [Line Items]
Net sales									289,714	291,309	248,842
UNITED STATES
Segment Reporting Information [Line Items]
Net sales									286,339	253,868	253,141
KOREA, REPUBLIC OF
Segment Reporting Information [Line Items]
Net sales									216,868	145,661	148,016
JAPAN
Segment Reporting Information [Line Items]
Net sales									169,480	156,021	131,336
CHINA
Segment Reporting Information [Line Items]
Net sales									148,890	118,435	97,148
EUROPE
Segment Reporting Information [Line Items]
Net sales									120,481	105,779	106,036
SOUTHEAST ASIA
Segment Reporting Information [Line Items]
Net sales									$ 110,760	$ 104,197	$ 96,602