Schedule of Segment Reporting Information by Segment Charges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Restructuring and other		$ 332
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues-provision for excess and obsolete inventory	6,205	213
System Test
Segment Reporting Information [Line Items]
Cost of revenues-provision for excess and obsolete inventory	741	919
Restructuring and other		244
Total	741	1,163
Wireless Test
Segment Reporting Information [Line Items]
Cost of revenues-provision for excess and obsolete inventory	$ 3,093	$ 2,668