Schedule of Amortizable Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2016		Jul. 03, 2016		Dec. 31, 2015
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 497,547	[1]	$ 497,547	[1]	$ 546,388
Accumulated Amortization	373,929	[1],[2]	373,929	[1],[2]	303,227
Net Carrying Amount	122,069		122,069		$ 239,831
Intangible assets impairment	83,339		83,339
Wireless Test
Finite-Lived Intangible Assets
Intangible assets impairment	83,339		83,339
Fully Amortized Intangibles
Finite-Lived Intangible Assets
Gross Carrying Amount	48,000		48,000
Accumulated Amortization	48,000		48,000
Net Carrying Amount	$ 0		$ 0

[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.