Goodwill Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified															6 Months Ended		12 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2012 ACS	Jun. 30, 2012 ACS	Dec. 31, 2012 MFS	Jun. 30, 2012 MFS	Jun. 30, 2014 MCE	Jun. 30, 2013 MCE	Dec. 31, 2012 MCE	Jun. 30, 2014 MDS	Jun. 30, 2013 MDS	Dec. 31, 2012 MDS	Jun. 30, 2013 Micronetics	Dec. 31, 2012 Micronetics	Jun. 30, 2014 Micronetics	Dec. 31, 2012 Micronetics ACS	Dec. 31, 2012 Micronetics MFS	Jun. 30, 2013 Micronetics MCE	Jun. 30, 2014 Micronetics MCE	Jun. 30, 2013 Micronetics MDS	Jun. 30, 2014 Micronetics MDS	Dec. 31, 2012 KOR Electronics	Dec. 31, 2012 KOR Electronics ACS	Dec. 31, 2012 KOR Electronics MFS
Goodwill [Roll Forward]
Beginning Balance	$ 168,146	$ 167,551	$ 169,459	$ 123,651	$ 159,279	$ 113,471	$ 10,180	$ 10,180	$ 134,378	$ 133,783	$ 135,691	$ 33,768	$ 33,768	$ 33,768
Goodwill arising from acquisition																46,509		46,509	0
Subsequent recognition of deferred tax assets from the Micronetics acquisition															(376)		(504)			(376)		0
Subsequent decrease of deferred tax liabilities from the Micronetics acquisition															(414)					(414)		0
Goodwill adjustment															(1,118)		91			(1,118)		0		(701)	(701)	0
Goodwill adjustments																	595				595		0
Ending Balance	$ 168,146	$ 167,551	$ 169,459	$ 123,651	$ 159,279	$ 113,471	$ 10,180	$ 10,180	$ 134,378	$ 133,783	$ 135,691	$ 33,768	$ 33,768	$ 33,768