Schedule of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014		Mar. 31, 2013
Segment Reporting Information [Line Items]
Net revenues	$ 321,010		$ 280,367
Income (loss) before income taxes	(1,873)	[1],[2]	(1,426)	[1],[2]
Semiconductor Test
Segment Reporting Information [Line Items]
Net revenues	261,737		211,506
Income (loss) before income taxes	34,600	[1],[2]	13,766	[1],[2]
Wireless Test
Segment Reporting Information [Line Items]
Net revenues	21,210		33,598
Income (loss) before income taxes	(25,085)	[1],[2]	(9,997)	[1],[2]
System Test
Segment Reporting Information [Line Items]
Net revenues	38,063		35,263
Income (loss) before income taxes	448	[1],[2]	1,530	[1],[2]
Corporate And Eliminations
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ (11,836)	[1],[2]	$ (6,725)	[1],[2]

[1] Interest income and interest expense and other are included in Corporate and Eliminations.

[2] Included in the income (loss) before income taxes for each of the segments are charges and credits for the three months ended March 30, 2014 and March 31, 2013 that include restructuring and other, and provision for excess and obsolete inventory, as follows: