Details of Finite-lived Intangible Assets by Segment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,385
Accumulated Amortization	(2,743)	(2,887)
Net Carrying Amount	1,642
Equipment
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,170
Accumulated Amortization	(2,142)
Net Carrying Amount	1,028
Intevac Photonics
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,215
Accumulated Amortization	(601)
Net Carrying Amount	$ 614