Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Oct. 02, 2016	Jul. 03, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill impairment				$ 254,946
Goodwill	$ 238,589			238,589		$ 488,413
Intangible assets impairment				83,339
Intangible assets	114,146			114,146		239,831
Acquired intangible asset amortization	8,487		$ 20,053	44,725	$ 49,119
Wireless Test
Goodwill and Intangible Assets Disclosure [Line Items]
Employee reduction, percentage		11.00%
Goodwill impairment		$ 254,946		254,946
Goodwill	$ 7,976	7,976		7,976		$ 262,922
Intangible assets impairment		83,000		$ 83,339
Intangible assets		$ 5,800
Wireless Test | Sales Revenue, Segment | Customer Concentration Risk | Minimum
Goodwill and Intangible Assets Disclosure [Line Items]
Concentration risk, percentage		51.00%
Wireless Test | Sales Revenue, Segment | Customer Concentration Risk | Maximum
Goodwill and Intangible Assets Disclosure [Line Items]
Concentration risk, percentage		73.00%