Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jul. 03, 2016		Dec. 31, 2015
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 497,547	[1]	$ 546,388
Accumulated Amortization	373,929	[1],[2]	303,227
Foreign Currency Translation Adjustment	(1,549)		(3,330)
Net Carrying Amount	$ 122,069		$ 239,831
Weighted Average Useful Life, years	6 years 9 months 18 days		6 years 8 months 12 days
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 333,421	[1]	$ 382,262
Accumulated Amortization	259,364	[1],[2]	220,346
Foreign Currency Translation Adjustment	(1,138)		(2,444)
Net Carrying Amount	$ 72,919		$ 159,472
Weighted Average Useful Life, years	6 years		6 years
Customer Relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 110,602	[1]	$ 110,602
Accumulated Amortization	89,674	[1],[2]	63,722
Foreign Currency Translation Adjustment	(119)		(258)
Net Carrying Amount	$ 20,809		$ 46,622
Weighted Average Useful Life, years	7 years 10 months 24 days		7 years 10 months 24 days
Trademarks and tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 53,034	[1]	$ 53,034
Accumulated Amortization	24,581	[1],[2]	18,889
Foreign Currency Translation Adjustment	(292)		(628)
Net Carrying Amount	$ 28,161		$ 33,517
Weighted Average Useful Life, years	9 years 6 months		9 years 6 months
Non-compete agreements
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 320	[1]	$ 320
Accumulated Amortization	140	[1],[2]	100
Net Carrying Amount	$ 180		$ 220
Weighted Average Useful Life, years	4 years		4 years
Customer backlog
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 170	[1]	$ 170
Accumulated Amortization	$ 170	[1],[2]	$ 170
Weighted Average Useful Life, years	3 months 18 days		3 months 18 days

[1] In 2016, $48 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.

[2] Includes an $83 million impairment of Wireless Test amortizable intangible assets.